Physics Unit23: Light and Geometric Optics - 51fly国际课程 (51fly.win)

1#

Reflection, refraction, and the formation of imn/ afkf25n9qzo*y-9 vp )pf4 d.bdkozages by mirrors and lenses has been sd pk/n*ayov z4-b.ndffqkz2 9fo9p )5 uccessful described by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidench:,zuu. dqm c,e

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirrors work is zn k 1badfhgz-y*r(5zr:/:fm

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an image tha3qxp z:bh(xx) l;d;bqt is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce i7 q1x xiy6 lcu;kat,pc is/45ai* 2pizmages which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually pass through the image loca) n1eqg w5cn7stion, and would not appear on paper or film placed a)sc175n wne gqt that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pp.kcvvd y )d,93/n4glv4dadvass through the image location, and could appear on paper or film placed at the that lopy/g9 kv lcv3 v,ad4).ndd vd4cation is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a virtual imrel vrfm 84+g3age?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on thewexj 79 /vxjy6 outer surface of the spherical/v7 jje9xyw6x shape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection i8-j;bfzsd 1 nk2hr1itakes place on the inner surface of the sphere is referred tojsz8k i21 n- hrb;1fid as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the concave mirror isgn0fvw;z rpp:z 0g7v7 r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror's axis, s6gi fl utit5f1s)6o 1r*ir qey7 j+i9btrikes the mirror's surface near its midpoint. After rgrseb) ti j116+q7*6fitolfi ru iy59 eflection, this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to the axis is 6fay .0oq 67fs o;*0bg lmxtrcreflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's axis, mv g4ue 4bx0lpo:ob4,2i g*qno2dqb5 crosses the axis at the mirror's center of curvature before striking the mirror'xg bo,g0 bmq*42e4 lu:4obdno ipq 2v5s surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the center of cu:zql r )h*lu)arvature is refl a*r quzhl:))lected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mihing:/bgdcd t i6+9y:da 5-uirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, thibdihd/ia 6 +9d -:u yctigg:5ns ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path tz pdlkk6d c.7uts. +iaae (5p4hrough the focal point is reflectezp+6. ckdtspe il(a.d4au75k d

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three r:2vwr t i b3oka(y9ty7ays for finding the image position due to a curved mirror.2tb:kyry(79w3 aovit

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave d9h*nwu3t v)z2hh cnye4p z,7mirror, exactly at its focal point,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image, and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mi;7eo zd xtpel)211c2 +ibtti xrror's center of curvature. The image produced by the mirror is loca)o1t;p2x2be d+il 1e t zxcti7ted

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirror's center of curvatug(3a*x47r oruqh5 vh2fypcz-re and its focal point. The image prrhh ya rzf*x2 4p7 ocgv53(-uqoduced by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface and its fo)f;3c do. j(log3p 6owg fng9gu. kg9ecal point. The image formed9u3p9go efkg;cfgjgd)3 olw (.no6g. in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same di-ht8 d35rjn+gt lxc(v5 w qmn3stance from it as its radcg35j+rq5nm xd-3 w v(tnl8t hius of curvature,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at f/p,b:vqb jib7nc82 pthe same distance from it as its focal lengtjb nb:qip ,p2fb/8vc7h,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mi3jh.ygdocc6 2ay g+u+b 22 hwbrror you see a magnified image (a great big you) and sometimes you see a diminished imageb.g2hcyc+hd by+owuj ag223 6 (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrors pr c7epec-,o(6dpdx: ok oduce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produuh 53bz 0(n(i wtqymh8zche*i)ok ,(fce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces*md(mflmnia8*m. -u k an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an :k )zsweopvan)3 ,:t limage which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mirror meany slrwug5 pku;/22 -bsu/ pqe+s

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive,r3dh9uuve rm3x/o:e m/ fa0 3g the image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negate8ipaqdotsh+ m 7n .y9)-tjs5ive, the image formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a positive valar4 uye/noy90ue, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative value, )9crc nviuv59the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is larger than one, then the image--dkx0 ot 9 q7s gj/wusy-:eie isu7/o9wgj-i-xs0 ed qt:-e ksy

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is smw ; e w; :dwugqdfif*3kh2xv*2aller than one, then the image iswg22 v3w;kduw xfedh** ;qi: f

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnifica3k4w4v 6jp,bhndm2 gdtion is equal to one, then the image is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastesty, afo 5ws,wm 8;cy 41x (resn 1fe4ck2w7jfud

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index of refractionz(g u-x ;qh,q oo5g5ss

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a medium t(e,mayydxw39ur 5a/tr n 5(jwould imply

A. that the speed of light in the medium is the same as the speed of light in vacuum.

B. that the speed of light in the medium is greater than the speed of light in vacuum.

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction oftrlty g+t0dlrre0r3,o( c7s 4 diamond is $2.42$. This means that a given frequency of light travels

A. 2.42 times faster in air than it does in diamond.

B. 2.42 times faster in diamond than it does in air.

C. 2.42 times faster in vacuum than it does in diamond.

D. 2.42 times faster in diamond than it does in vacuum.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidence zzyyzlra:5 ,f*p)e b2lza.i1w x;+hh

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into a densc8v2pk dt 1*o0he4 onger medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refr w,yhi *.8kmuqaction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on b39- k k5.8lwwppe arba glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is bas ;m( q bk+e/:cycir6ased is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for ays2n0 )/tc tvjtdk: i8 beam of light passing from water into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses w* 3jk9h.rw a3qdkyphv7ne6e- ork is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at the center callei(tkf2x ye67cw,l 8 ub/v +)eonlly.dd

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than the edges 63dar ojmnroh58 .z ,ks+ ohrs(yu*h *are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickedq:uza c-p21c z3u*qhr at the center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar exceptloj,dsgr: lz u.( g+h. that lens B is rated at 20 diopters, whereas lens A is rated at 10 diourl , .(gs.dh gl+oz:jpters. The focal length of lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave lens, strio bz; rcgjtl)4,hp4dy17 ft1uj a e(-zkes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to ,jg1arel) tb74uy ; cztd-o1 z(fhpj 4the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a convex thirq/0u2lnhy (en lens, strikes the lens / nrh20(yqulenear its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three 5. -m/w1m cqon(u yg m3tqtkl4rays for finding the image position due to a thin lens.3 t qu/yto(k-ml45.1mcmnw gq

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has foca 8e9psyi fo3yiuw 30y*l length $f$. An object is located at infinity. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal9-)u.; r buvepye;td 1ji6ss k length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal leng;6k -bwq b(vigu2kz w q7p1*xyth $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focazz. zcgm4 ab/p0sj j(cg90f.u u wssjkf8s8;:l length $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal xe rz,4o0 5+tlan;p cglength $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed bew(r,vf;:t a 9hk)q dpztween a convex lens and its focal point. The image formed isa v fw(r)q :;hdpk9t,z

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave lensesxzzau*91 bmxub+5c ) o

A. are always real.

B. are always virtual.

C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.

D. could be real or virtual, but always real when the object is placed at the focal point.

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare stamp you see sdjc (scs)/ dq77py3k through a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screetsy j -*x,ec+,yt ckvv 4lqr+*n is placed a converging lens of focal length 24 cm. The filament of the lamp c x4ql*,-yt e,c*v rs+c+tjk yvan be imaged on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focal lengtt(qht 14xsxi *1b.yxb hs $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) lensesu2(aj* u4 qkws are placed in contact. If each has a focal length of 20 cm, h ukwqusj(4a *2ow would you expect the combination to function?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surfacednjvtqh5 tmjsh 8 c,6v-a2h;. with an angle of incidence of 2,n 6t c-jm thad 8j;.v5vshqh$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of a plane mirror. The8kp p3 rvft7f1qq8 khw, dcip).d )h6qb, fk7l image formed by the mirror aht7dkp bkvf7qf6)lic, 8pq.f k d8 q,31h)wrpppears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image whet1 3psr(:u,ou6e-q,5e/mg ktaqux p o n you stand 0.75 m in front of a vertical plane mirror e5etaq6(xu,ut3p mg/o ,:1 q prokus-?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach your image when you approach a vertical plane mir djoinq3(5u p+ror at a speed of (5jqn 3o+ udip2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 cm. j)b)dxh (rx 6um7x.crHow far from the mirror is the focal 6xbxr7)mh(.uc )xd jrpoint located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creates a real image 30 cm from td jz-2f:z;cuche mirror. What is the objeu;zzc 2dcjf:- ct distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in*--- +uljaferwad3 uj e9uf0d front of a concave mirror, and the image is 3.0 cm in front of the mirror. What ufa+3 fjeu jwl0rd* ade-u--9is the focal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focal af m2h8xbd3 c(length 3 cm. Where is the ima (hf2xd8ba cm3ge?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An object is placed 10f7xth6 ,ju1 ) ymxwas/ cm in front of the mirror on the mirror's axis. Where is the xx,f)6 tam1y s/7jhuw image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirroat 2apfd.omv/zn2r. e1- ,iucr -;wz tr has a focal length of 20 cm. An object is placed 30 cm in front of the mrtz2 2.e ra p/o-,m;n 1auwc-v i.tzdfirror on the mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. The image is 4 dqrqlj.m1- pyr49 c:w y, rca(mb2tr4.7 cm tall, and 10 cm from the mirror. How tall is thcbar qdt-jp4rrm9lmy c r.y412( q:w,e object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 1538pf6 ojbh8j a2-xpbqs)g;o t cm from a concave mirror of focal length 20 cm. The object is 4.0 cmotjs6q8hobpfb a j ;8x23p -g) tall. How tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. Theti96n u ehtgzh k3,4)p image is 38.6 cm tall, and 14.8 cm from the mirror. How f6 h u3hktn4z9p)egti,ar is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 mycy yz rr3xv,9 kg/cd8 hj9*4cm from a concave mirror. If the image is 4.0 cm tall, how far is it from c d9*g8x ch/ykj9y4ym vr,zr3 the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of fokr97e ,v:dxnv)z5axmbd.( uk cal length 20 cm. The object is 4.0 cm tall. Where 7z) rnvdx ,de.u9m(bkkx5v a:is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (concave mirror), k u,/bq0,h2qxcyyeqv5,nvm-yoy -dy vmv 7 02 the erect image is twice the size of the object. What is the xb/v0c-2y dm umh, ,qy50nye v y 2qvk,7qvyo-focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a concave shavi xzs 2:d)rzcq.7-ztgn4 ,hnr bng mirror. If the image is an erect image 1.5 times as large as the object, what is the mirrs hzr-qb z d:t4n.z, g)c72rxnor's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirr7 ek df;yzd c(np+v8)jor with focal length 5.0 cm. Where is t7zf);dkjen(v8+ dp yche object?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -kxan )d:a o8*e c zk8viy-/sx)5y f.qp20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Why8v 5pd o.x ))ia yekzcf:sn8x-qka* /ere is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a gt4tv i u)b2tdlg;jl ;3qca :82 xcxu3focal length of -20 cm. An object is placed 30 cm in front of lavt833i lj)xtg;xc: td2uq2c4 ;bguthe mirror on the mirror's axis. Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a convex mirror. xe8a,*fo6fy q The image is 5.8 cm behind the mirror. What is the focal l,o a6q*8f xfyeength of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The imgtu0-s h;0lo yage is 7.80 cm tall, and 14.8 cm from a convex mirror. What is 0-ylo; sg0thu the mirror's focal length?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an iv s:4a2 xtkcm0l.yho1ndex of refraction of 1.50, what is the speed of light through it?.l:12axyokt4 0sh vmc

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass interface at an ang p*lsrm3m01 jzr gsi1w pmp 05e;,twi.le of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from airrdy-n2sk.pm7h3no) c at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The inc k jc*sfq8ra h80ap0e+oming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and evenly over thnkw.snt6xt , :e surface of water on a windless day.,. tkx:wsn6nt What is the angle of refraction in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the suroanxd1f ami )s7jxiuz/2d 8f92v 1x(aface of a still pond of water. At what angle must the diver shine a beam of light toward the surface in u)do xmx1v(9 7jnf/2zaixasd 8af21 i order for a person on a distant bank to see it? (The index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, tra1fcyebfvd, gafpz,/m-y .bz3qc6 2*p/hc .r f veling in air, strikes a plate of transparent material at an acfmc ,vfg3b.ap 6 dz1qer.py/y-zh, f bf*c2/ngle of incidence of $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light travelilw.5p pizg59uemvrqd. 1, tc7ng in air is incident on a slab of transparent material. The incident beam and the refracted gve5i759. zt, pl1rdm pw.q cubeam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.46. Light is paszx dsplap515; ye2c 6qsing through it at l pc6e55zysqdpa x;12$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light travelt6 wcmbc5t mdxaqx08.f;vp6( ing from crown glass (n = 1.52) into water (n =t0 b8w6vtm;(pxc6a m c.fd5qx 1.33)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refractioi)l b d20x f6lhq* jhu0ven9+to/p6h8f mjve8n of 1.50. What is its critical angle of incidelh/6hbql* n96h ejm8+tu0p )o2f0vejv8xdif nce?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear pa+lnc1t y. t9s4 k uau+c3yn.klastic with index of refraction of 1.50. For what an+ka 3y lac9ky.cs41t u.n+ntugle of incidence will light remain within the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substancedrj qgy1alcok 6)6 qat*. y9 na)jzfferm7;62 is measured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance fromb3h :7nbie m)d air at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 meter long and has a diameter of 20 mm. Its ends are pe0 vuao8 mber b .p05ot4x)l.v ,ayt:ozrpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make5ryl:a b 0xpt,) 4mbve.o 8o auov0.zt before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal length converging lens.m:2bx x l1;xmuosh/ q* How far is the image of this object from the le2*;mmbhq: xxx1 /so luns?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with foe d2aaq( ;-pn9qp mx)0u8nkcvcal length 4 cm. Where is the imageax2cvd0pq -9q(mku8 ;nnp)ea ?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a coni- dit ;yv 3ejub(g*-ob2imd 6ax +6gmverging lens, and the image is 4.0 mm behind the lens. What is the focal length of - y3( v e*dob2 -gbtij;iud+a66gxm mithe lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.o ; co40,ziz gdtcc.6p0 mm from a converging lens. If the image is 4.0 mm tall, how far is it from the lenspc cz o6z0dcig,.;o4t?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lfd** n t;e*6pr e/k 1pm4hohhpens the inverted image is half the size of the object. What is the focal length of this lens/n 4dt r;*m*e1pf p 6phe*okhh?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal length 5.0p3zl56 2y8 fkd4lszoi u( qkn.)b o;mz mm. Where is the )oi; bk 38.lmqfuyzz42don6ps klz (5object?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm 7gxv2wifu )l 6ur 3)kc 1n+0igb3ziqjfrom a converging lens. The image is virtual and 6.2 cm tall. What is the foca0jbrqig l37z )nc)1k2 fi +6xu ug3ivwl length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lens. The image is 4.0 m4+uky) 7vxm yss) 2 ;zdjudd*x9 0zevym tall, and 9.0 cm from the lens. How tall is the objez yd42su xzuvy))s0vyx;*kjd+ dm97 ect?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a converging lens, it forms a real imuds ,o/-sef m2q0163jqhpz m bage. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of theojme1 s,u-mqdpbsz320f 6hq/ lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 cm from a thin convex l5jyxmbr-zp;w 3.l u new +1(vsens. The lens has a focal length of 10 cm. What are the values, resp;1 pwwej3nur+s mbl(5-z y xv.ectively, of the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a divergid0zf(lz,v oqz*g7 joh-s i:6j ng lens with a focal length of 10 cm. What is the i, (7ozlq hi v -j0:6z*ojfgdszmage distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens wi1us5(vn a3n;gv+0v c icci hi8ae xi54th a focal length of 10 cm. What is the magnific vx3caaihi n(0vn5s+u85gcc;1e4 iviation?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm talo(fh*dxn00e v l, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How tall isfn0*0 hovxe(d the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in front of a diverging lens. The image is 2 (ybyr:rz8w4 a- u.mtg.5 cm tall, and 7.5 cm from the lens. What is the focal length of ty:(u gbw - ra.4zytmr8he lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens. Ifbk5 b1tfv znw eo+c1(6 6 eb+saxy.8rp a virtual image forms at a distance of 50 cm from the lens, on the same side as the object,f6x . p1e1swkbba6ytznrebc5++8v o( what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must the objec;r;z fz /g4blgt be placed if it is to form a virtual image magnified in size by a factor of thre;4g zz/r;lgbf e?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length lens, such as is used in many 3e0s b5 ltiheu16dn( b35-mm cameras, must an object be positioned if it is to form a bb6 e1t(e5luh 03indsreal image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are placed in contact. Whatoc- t(.fk3x:leqr y 1ne-kc p3 is thenpe3 rk(-kct1lxo f.-q:ec y3 focal length of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has rcucp a6j+g+-.7s t;st78vsfmvz aeb 2adii of curvature 46 cm, and is made of glass offs ;emcb-c8u+ 6ts jsz7ta vav2. g7p+ index of refraction n = 1.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n v+m :vbjvd9s)5 odee8= 1.50) has a radius of 40 cm on the front side and 30 cm on the back side. What is the focal length of thvv+b5dv o )98m:edjsee lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece oft *d+ph wtaw+s-i8s*i plastic (n = 1.70). The radius of the front surface is 20+*sit* pws8+dht -awi cm and the radius of the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm. Itp*qhvrw7 64qg is made of glass of index of6* rp7qvg4qh w refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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