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

1#

Reflection, refraction, and the formx cpah,gs5 zygl /.b)-ation of images by mirrors and lenses has been successful s)agh 5. ,c/bzpg-lx ydescribed 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 incidencs5)8/vvfduxc)4 dq roe

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 wo, *4kk()dd,9cucxzg-iap k k nrk is

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 imageb, hqc,:; pkprftaq9 4 that 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 ixaw8s+ ,a3tyymages 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 locat 1ku u*g0z+p k+v3wuttfd8k5 yion, and wouwfv+ktpz 081yu3 kukt*5gu+d ld not appear on paper or film placed at 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 lc ff jh5u+ usnet,o676ivi 0z0ight rays pass through the image location, and could appear on p6 fti e5i7f6 czs0ovujh0n+,uaper or film placed at the that location 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 virtz,/ u/sj+l jeniq*z)gual image?

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 the outerklgh46fv kfh) qh:e14 surface of the spherical shape is referred hg:kv)4lk e1f6fhq h4to 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 takes place olgi50o1dfaxn3 (rhvq . wsu2;n the inner surface of the sphere is rv u sl; gaqr32150f(id.n xohweferred to 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 curvaturebyvb64p fc9cq u08 go8 r/xubh1l: n.b of the concave mirror is 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 c k+eo op/.nxwf4a2 ;maoncave mirror's axis, strikes the mirror's sunw+mxea 2o ;of/ap 4.krface near its midpoint. After reflection, 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 1 v ( 0qf:ubi/obw3vxmvtd6-ej o3r) ypath parallel to the axis is reflected

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 ob xmtp)-q* jgv k66h ab3q0lt(08wj uegliquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflectiqp6k0jt (*emv08twa u)xq gh-g 36bjlon, 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 k+tm;ldn; 6lci;0 q1.gacyngcenter of curvature is refl0 nca;6qggck+l;n; td.l1yi m ected

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 mirror's surface, crossv q f6y 4:l6fbvvch.(ves the axis at the mirror's focal point before striking the mirror's surface. After reflection, this ray:6( vl cvvb6v.qyhff4

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 through the focal pod w1;cgekwy 1ron(d1m+6(yrdhp0 +o eint is reflected1cyw hgydpr ;+1okemndo16 rw (+0ed(

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 threev8: 87q xn r2qx8jxvgz,u+fsi rays for finding the image position due to a curved mir2:sx x8 jq xu,qz87vv8i+rn fgror.

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 mirror, exactly at its focal pointfi2p9 (7jezi2 dsvr hna- i4-n,

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 cot15d:na.y bzl prdu**ncave mirror's center of curvature. The image produced by the mirror is locpt lanr.b *d5uzd :1*yated

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 pf*jsl3.k,hs,gyc .dz +pv5 f cf0jq+a concave mirror's center of curvature and its focal poin+ .fgpch.pfkscvqd j, fs5z+ y0l* 3,jt. The image produced 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'sfzz*+hg3wk1 x c-)j bw surface and its focal point. The image formed in this hg* 13)fzww jxc-kbz+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 convex3a9t ;nlxtp7c mirror, at the same distance from it as its radius of ptx ;at3l7cn9curvature,

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 b u /cgellr,w7yf j6/bz-xs6*a convex mirror, at the same distance from it as its fo-bbjxu yrg6l,*e/6 l7 sz/fc wcal length,

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 mirror you s4r lj0b4htmc:l hxp6:jiqwc +8 u7mp)ee a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what lh)t0r748cm hx jm4ulbpp:i6c q + jw: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 produce ima 3se /otgkt zhtcaha9+ *uu:72ges 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 mir .l avqjae*1 jy0zt*wo i,xm9*rors produce 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 prozol()*w,(symbr ha ) mduces 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 imag-j4c) jsm3vpoe 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 ,12z qdu 0/qoi dtkgo4for a mirror means

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, the ima,um ;nsnwalg / zamn6k:7+ g(fge 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 negative, the image formed is,tq b/(vq:a)1dpu *gh3hf b9l ch :kcj

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 va i wmk.o;f6;we bhw tr36tp;7wlue, 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 i*r0bydp*zx ;a negative value, the 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 f4l3u h c0sl n4* wr/g.wzb5fdmagnification is larger than one, then the image isdwzs.lwcf/0bf n4 3 u45rlg*h

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 smaller than onep-nb6d ni;u5o1yoc 1isc(g0t+q d f)g , then the image i-o cng1;+c) btuqfi(o id 6 s50dyn1pgs

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 magnificatum (c-x,bmq.. a r)jgiion 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 fastesiay x,k nf17b w,3rippam 91q78xtig:t

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 mbxo9rf z/0xwmfz4 6o- aterial substances, the index of refraction

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 medh )h*cwn2cp8 4jrra 4vium would 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 refractj.ba-wdtq4ybn0dbes t )9 0d1ion of 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 incidencec2tupg7sy ryd5) 2s3j

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 denser medium is re/itv7-g)on t da:0y24gjuwxn fracted

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 refraction will bg/ezkv-(yv z qa50c*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 trav7ogx37dmx.kxb;gs0i r x7* 8akgwyh6eling in air, is incident on a 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 optiz6actf3 2 nnb2cs is based 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 a beam of light pnk 7atcff/2k( assing 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 44i1a7d1: l mh4rotyxiedf gjuo+w,0ork 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 thickee :jt;8 /tplfvst at the center called

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 edgeq xy( c kmjusij-h3jn,;3 e6a4i;9r zss 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 thicker at the 91ga2ypqqa xq l921)nbs-x an 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 except that lens B is rated at 214wk8niaz dn4 0 diopters, whereas lens A is rated at 10 diopters. The focal lengta8zindnk 14w4h 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 col9tvnajb26 e1va g7q;:ra )gbncave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges travelivjqn61aaa egb r72tv ;:lg )9bng 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 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 convq aq n8 ysv1/hz(y.ar)ex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges q .q8(z)a ryh ys/nv1atraveling 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 thrym*h2ex++tv f adgt88ee rays for finding the image position due to a thin leny* f+xa8 v2+gdtm8 tehs.

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 focausg-ov v;) ys4l 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 focal d5drf 6ks()p (jccfukba ,+u4length $f$. 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 focb au.vj5-liq3 al length $f$. 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 u37u,phm u o;xkh -:idfocal 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 *2pr legp 9. -wpsrv/ylength $f$. 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 between a convex lensg dg.nd8t3,hw./dk s h;ejns . and its focal point. The image formed it;g,s j. h.dwghd83nnk/e sd.s

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 lens ,pkrdifzo v16u06dofav,h07 es

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 9d., ouiq;ggdg:8 q1xeybj3t)b ;e oqd/- vxcsee 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 *juj;my,x e6 nlf8ex,a screen. Between the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imagedfe, n,j6 u*yme8l;xxj 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 le+jd 6y*zc dot)ngths $f_1$ 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) lenses are pl8bdgrjh; e/ f+;ixit4 m )v ew)be j/1l1rfw6eaced in contact. If each has a focal length of 20 cm)m8 64re ejevd bfxhiwt;1;g//bw +1 f)ijlr e, how 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 surface with an av 3;brd0v kzi6td80rsngle of incidence of 8sv ;k 00r 3tdrzidvb6$52^{\circ}$. 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. The image fo;oq: tr(1rlq(:ftb th, aikj:tpj05j rmed by the mirror appearsj,i:(oq;tt5blrj(hq: :10rf jtt k ap 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 when you stand 0.75 m in front of a verticaigne2k2d-c sp d1/mhm06jyo b,* .a sol plane mirroos0jo ni,2ym/-6deakh 2 g bd1.mps*c r?

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 approgzc.x uph3c o41,h+ z-j ykk(un6 ptj9ach a vertical plane mirror at a s6x1cj. h3kpz u(chpj-g,ky+ tnu9z o4 peed of 2 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 rash0eu+rztbs 2; ft6v*2 yj u3vdius of curvature of 20 cm. How far from the mirror is the focal point lov0vjss3 u2u;z6 y terh*tb 2f+cated?

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(g;z1j rjq zu; real image 30 cm from the mirror. What is the object dista 1gzu ;jrz;q(jnce?

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 front of a concave mirror, and thwwvn8.haq4/f w9wc8 a40 nqlwe image is 3.0 cm in front of thlqf/9w0wcq84wnw ha.n4wav 8e mirror. What is 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 l (u8z fnyyn:umx6 )rf(wdt4 t(ength 3 cm. Where is tffu(u6t :x)ywr dnmnt(84y z(he image?

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 leng lus/z*fx +j8wth of 20 cm. An object is placed 10 cm in front of the mirror on thzsxf* wj+/8ul e mirror's axis. Where 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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77#

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 22r9*/hrbv k th0 cm. An object is placed 30 cm in front of the mirror on theh/*rt2 9rhb vk 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 cohqa ;n,23xe.uky5g jh w* h9snncave mirror. The image is 4.7 cm tall, and 10 cm from 3n9ysh* ; j ,gn. 25keaxqhhuwthe mirror. How tall is the 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 15 cm from a concave mirror of f7 e 9smilvxcfgvf6( 3j o.: y)1pyvm5tocal length 20 cm. The object is 4.0 cm tall. How tall is the imag 63smg)(xyfj7mv:1 lc vtpy.5fvio9e e?

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. The image is 38.6 cm tall, and 14.8 cmhfw 7y-x:a /rgi:oc,p from the mirror. How far is the object from the r7op-ah,/ g:fw yxci: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 cm+-tk k9ay5lhs +uz5o osqf ;;c from a concave mirror. If the image is 4.0 cm tall, how far is it from the mirror?- o ;yfhqc os klsa+955;kt+zu

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 mirnaa3wb5v6pn*u,8da du:j 0ncror of focal length 20 cm. The object is 4.0 cm tall. Whe 0a ncv6n8b5jda:,ndup w*ua3re 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 (concavedo o4psa(2): dtfz2lkg,g /fq mirror), the erect image is twice the size of the objec ltp,22(k zq/osadgg o fdf):4t. What is the 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 conca0)ulp54b3lac( at q))w ,fxvvn. k zudve shaving mirror. If the image is an erect image 1.5 timu4)3b zwt) 5 lvc,dkalpxu.f()0 qv naes as large as the object, what is the mirror'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 mirror with focal lkeq;.q/;0g x jxr4ctz ength 5.0 cm. Where is the obje.;j/40qkxr ezx ;ctqgct?

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 mi7 )lgn/ .sprobrror has a focal length of -20 cm. An object is placed 10 cob7n .gr p/)lsm in front of the mirror on the mirror's axis. Where 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 focal length of ;un:uesin t;y8b;wdp ;sh a+cc7g b(3-20 cm. An object is placed 30 cm in is; ;sg c8ae:y7u b( ;ncuw3;nbpthd+ front of the 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. The image is 5.8 cm behind the f7( +d25 :xrhm.enb anhfo (mb* 0jovhmirror. What is the focal length of the mirror?a+ 5mjn0 (2o: rbeb* h7.hfh(ofnmvdx

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 image is 7.80 cm tall, and 1 id/u* a-s,f1tmubq1q4.8 cm from a convex mirror. 1 muut*- a,fs qd1iqb/ What is 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 index of refraqjyx8e b x1*:*aol zq:ction of 1.50, what is the speed of light throug xozxl*qa* q:81 e:byjh it?

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 angle oj n5 5h7*qz2mra src1;rrqdv)f $45^{\circ}$ 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 ak,/8p b0c1 /f m5odvltxmi haeitr235ir 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. y st:/tm 7;ehtThe incoming 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 isde*(vq0pu* exy:h +hu 5.0 cm thick is spread smoothly and evenly over the surface ofhuydh(e*:vqu*p0 +xe water on a windless day. 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 surface of 9teb.uu;.ml-e6z pd2z 2jq nz a still pond of water. At what angle must the diver shine a beuzl p. 6d-eqzj9 2unz;.2t bmeam of light toward the surface in 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, traveling in air, strikes a plate of transparent mate1v30;k -d2q*ufl/ fmwppokd b rial at an angle of inciden w f3d l*qk 1;0uvpok-db2/fmpce 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 traveling in air is incident o lm4q1jygioa ma9ft+mg;1 *(sn a slab of transparent material. The incident beam and the rfai (lmo;j1*gg 4 mt1y+sm9qaefracted beam 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 refractionf:z-y+ioyj 5pv4hk-dglun7t)z0 sv + of 1.46. Light is passing through it at n0l zihg)yy:d-+vk fs5 -utpvo74+zj$53.0^{\circ}$. 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 traveling from crown gki:vl(g6c 9lz .5gc je-oisq9lass (n = 1.52) into water (nclk96g:cie l (-s. gv9zijq5o = 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 8er(o9l kn cvhm5oez4- -mh k;of refraction of 1.50. What is its critical angle of incidenc k (l he-krzmhmv -;oe8oc459ne?

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 plastic with index of r2 z) z:c3yhfadefraction of 1.50. For what angle of incidence will fhzd)3 ayc 2z: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 substance is measurero5ov v jy v8+ fn)jf963w2ihad 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 from air ayxf .m7 *1ds.1cf8w zjlzq1itq2d8aqt $30.0^{\circ}$ 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 diamete8:rh *xqiz ;m j4o(ulhr of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it h; 8l( :xrmqjohiz* u4emerges 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.5qm y1 6*mfbfvs3yw:l How far isl ffm35s:qy 1v6bwmy * the image of this object from the lens?

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 converginq2sde+7p ,ty1,4shr5i pvxjwg lens with focal length 4 cm. Where is txise,rjvs5yh 47w,d 21 pqp+ the image?

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 converging lens, and the image is 4.0 mm 9x5hro yfb-j w9uys9 3behind oy9 3w9r5bshj-fu xy9the lens. What is the focal length of the 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 4.0 mm from a converging lens. If the image is 4.0 tsq4bo.)8 w: zdc-enpmm tall, how far is is 84z nb.)tqewc-:dopt from the lens?

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 lens then.hlys4q4a ,3tn 5d gj inverted image is half the size of the object. What is the focal length of this lenj 4.ngt43l a5yhqnd, ss?

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.wrysnx(x (((m 0 mm. Where is the object(wrxm(ns x ((y?

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 fromdn/z9 sq sj+08 ldpos2 a converging lens. The image is virtual and 6.2 cm tall. What is the focal length 8ds+on zd0sj9/qspl2 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 imagkf:( yn/ 8pacg c4(r d2legvb7e is 4.0 mm tall, and 9.0 cm fr ngd:c(c/v7 egy8 2pka lb4fr(om the lens. How tall is the object?

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 red5 2 ;l tw/u/(qt6r wwg3tryqmal image. When the object is moved to 40 cm from the lens, the image moves 10 w/ 6wmqtwrtr;5 q(u3 ydlg 2/tcm farther from the lens. What is the focal length of the 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 dis nvw+kmxtt9g9 +,sl, xtance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lateral+,,nsg vk9xttxm+l 9w 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 diverging lens with a foc x*v;ev h*xjnaliz xczb *av,b4 28h--al length of 10 cm. What is the image di vcx,e h*z;xnbx82*- l zaa vjv-bh4i*stance?

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 with a focal ley7a+it r.ytt 7 nog94mngth of 10 cm. What i9 maryy774nt. +tgtois the magnification?

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 t.vojvj7v ej7tpudx.;6-q fh-all, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How tall is tho jxu;pdf67- jhe j.vtqv -v.7e 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 ims*ll8ifhpr,q 9oos34n ms4/ v age is 2.5 cm tall, and 7.5 cm from l44sql *si8 vfos no/ 9rh3p,mthe lens. What is the focal length of the 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. j,sv 15yh 8epoIf a virtual image forms at a distance of 50 cm from the lens, on the ovs5,j1pe8 yh same side as the object, 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 uzdpl3t 6/ux+ length 50 mm must the object be placed if it is to form a virtual image magnified in size by a fal3 zxut/dup +6ctor of three?

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 35-f2*gg 2nn-(xsri p-ttu 3 ldi4mm cameras, must an object be positiot4(x tu-2n srf* i-pid2l 3gngned if it is to form a real 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 wikg ea/)y 8z-tdth focal length 20 cm, are placed in contact. What is they8dge) za-t/ k 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 h5*0no rx e tj 4hlfo*;cr/jj8zas radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What ijloj8**;rjtx/f nc50zoe4h rs 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 glasndiy) bw.hplx5gm(4t 21mb oa oby3** s (n = 1.50) has a radius of 40 cm on the front side and 30 ct mhob1gy5x3.2 )m yo4*dwi *bnplb(a m on the back side. What is the focal length of the 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 usbkr olbvqd91*y1: co;ing a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. Wo*b9kqb:c ro 1;yl dv1hat 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 / 7yo kay;i njzpz9yrzf 9idfq*v*+:7to have a focal length of 40 cm. It is made of glass of index f fyz+7vyr9 i /on*9zd jzap7iq:;yk*of 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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