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

1#

Reflection, refraction, and the formation of images by mirrors and mdqoolg 0hyz;w8u,p .q 7s-/f3o ,d yclenses has been successful descri z-, .70qp3oyy;u8hqogf sdc/ ,wodm lbed 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 incidenc fc u3iyq/::v)v2yflc 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 ivs/ 9b0/s6sbu bsa povu+wx 4(s

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 a 5vxr/8x* rcwtn image 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 imagesgdhnmw abv*o/az:0w5ay 2q i ,*b i-7v 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 b9z vk ,j7;gi8r1qjz zlight rays do not actually pass through the image location, and would not appear on paper or film placed at that location is refe 7rzjq 8k1gzb;zj v,9irred 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 pass through thtxnsk8(ke3 -hq3* 6vh7z 0ulg dpawp4e image location, and could appear on paper or film placed at the that location k8a(64u0svhkzg3 hw7epl x dntp3 q*-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 aia2z0d4sto q+k: ff. 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 outer surface of jm9tq(glemviq n:8;-(ski4 f the spherical shape is referred 8k g(tf-m9svi;4e :qli(nmqj 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 takes pji .ls4 s81gvvlace on the inner surface of the sphere is referred to as aj8gs4 ls .v1iv

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 mi7afmusa42hy:gd h 40 nrror 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 parauhwrl 8i,; ,j)0yps emllel to a concave mirror's axis, strikes the mirror's surface near its midpoint. After ref jmrwe)y,u 0;8, iphsllection, 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 uf9f)rwr/c q ap;*el (concave mirror on a path 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 oblikwli 01 mpx/*equely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before str/k*1w0 xplim eiking the mirror's 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 ceyjmcu1 9ef mgah0;lzfl;1 +n 6nter of curvature is reflem0;gfnf+11uh; z6 yc almjle9 cted

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, crossela t7e; p.el6o3npplht3 p, (us the axis at the mirror's focal point l tpe;ll(op6,e.ap3u 3n 7pth before striking the mirror's 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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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 point is rutfg y8k* de/6eflectedt 6*ufgey /k8d

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 rays for finding the image positibmx )f11ciyg a op::t+rqem ,2on due to a curved ) mtgc,a1xy:i1f+ ro2 q epm:bmirror.

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 b3a akog v d6m :25ue2zxkvl-+of a concave mirror, 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 mirror's center of curvature. The imasi, 4y ogmjqjzd1,6 r46or/mcge produced by the mirror is locater6c/mds o i64 ,qr,moy1zjj4 gd

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 curvats9b 9*q 6trydture and its focal po srtytd*9 bq96int. 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's surface and its focal poijislc 6z3u 9 1 7zjnqxyy2e wi;w7+;nent. The imzinwq 1;c y+ nz9ew lx;jsu2i6je73y 7age formed 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 distance from i .)qtxcmq 7h74:s5 1 fcqpewwtt as its radius of curvature,h.cwqxcfq)ew4 ms q7: ttp71 5

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 the same distance fru26/cov+ 58p3.a qsucqn xdpoom it as its fo uas q3poc6xc/52u 8dpo.nv+q cal 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 see a magnified image (a greyim9m;a ,ne cg0.isoo9omz 73at big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) s o0,s ; z7mo9i3.9egacmyionmide 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 produce imat7pag 5d7jb8u9idg3bwaax64 1 ib+ ouges 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 produce images eg*90sv gt5sw 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 sph 74zjd1t t yxwziae4(1erical mirror produces 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 mx tmw teqf29)-v b4.vproduces 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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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification w52 -*sfaannbk,)gmu -zhv2ofor 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 positiwc 4 0t/c6f gq7hmr3fxve, 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 no)22gq-7 y9qqme-wtn cwjl v +(8 -yby q(qzyyegative, 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 valej0xx:j)pv) pm85fhque, 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 ne s9qqh6:8bqt - k3h5;babrmhggative 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 magnification is larger than on o)n smx2g28/+bt /n /pam(i*oaxuclc e, then the image ism gl//npn 2+ca x )bxa(oot/iucs8*2m

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 magn:aatal2 ibsn n(a/wtk)p2o :0ification is smaller than one, then the image i2aawon :):/t sb0li pt(2kn aas

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 magnification is eque+bvew goo;6u4 u 9x m)qse:0ual 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 fastest+g9t s9x6xgkzol8 g:f d2s j mskp/h86

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 substan+1dbj n j5luq+ces, 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 refractio ,b9oz98 rf ylgi7pu)ln less than one for a medium 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 refraction of di9d(; iuzo28xsc cpz ;mamond 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 incidencul6l :o8,m9sw tj fuo-e

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 dens.iu 9ktflh96 0 fm6hwder 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 o t okwsc-+.s312abb pms3htl4a . u*tcf refraction 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 a glass platep dsnoq9p85sy0)hp e0c9+vkpo *m,jr 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 based isj7uzj)f4i/sq )qif y)

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 passing from water intom 4wo0ec6vgc ( 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 lenvjgxvii):wipw+ /zm d :39v 5wses work 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 t+f*:q db gt,tbhe 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 tha*vh,l e:6 vyk3a 7vtev-,c)ka t*fwx -;cvvsq n the edges 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 zl4q)frl d9)7 vzr-jd2p 9tcb 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 5wfu:jqurtr pyh /e:9ih i7.9are similar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal length of lens B9.fe qhyp 5u7rh i:9jw:tui/r 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 coaa *,; 8 8nldueiyt.b:wm(ahyncave lens, strikes the lens near its mi8ahua:iayy8;lw ent md ,*( b.dpoint. After traveling though 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 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 5bu 3u;k 0ihcswr;c-yof a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emers5iw -b h3;;ruc uky0cges 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 rays for finding the image pq vdp1pw5;o 1jl(p5c sosition due to a thin lenov;s5 5jwc1 dplp1(pq s.

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 focal length )0oly2k f9p sy$f$. 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 fovp lt1h gtsf9mfb-(wd46s9 wdy,h: z .cal 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 lengqa0x s9as vd8 x4shs;p*t+cj1 th $f$. 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 focal leng2 .c ooffbn5)rth $f$. 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 f*xpdl f )h,uy+d4v k(vocal length $f$. 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 convexk 2c 3ccywk,7fmb--v t lens and its focal point. The image formed t2kc3m,k-fc w7- bvc yis

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 l8o+qa (nu4/xxjrf,weenses

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 through a magnifi 6 oi +zetdb1;8vf+tsying 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 la2 m6yuxpx2.g m-jdz/wmp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As /z26xj- gpu2.wymdxm 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 leyr1okv.-ev1,r p5 1w kw/ rszdngths $f_1$ 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 fi)zf g7:bo yn2 x6ds-placed in contact. If each has a focal length og)nbx od :2f s7-6izfyf 20 cm, 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 angle 5qdgu 85rbdk/ g .rwp,of incidence of w8. uprdq5r bdgg/5,k $52^{\circ}$. 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. y l. uj 6ya6:axvwt;y;The image formed by the mirror appearutaw;;.:x6a l yyy 6vjs 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 vertical plan*o) x:lvkipx 2v qs9s-nrk +;ne mirxrio) nsvk2k -+: qn*s9;xpvlror?

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 vevd 58 ben17shqrtical plane mirror at a speed of 2e8b 1s5 qnvdh7 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 ju*.h )7xm u.stme pf:a radius of curvature of 20 cm. How far from the mi.uu*te).msf:m j p7xhrror is the focal point 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 rad h:gju- fsa*qt m4 )15y 6swwev(beya:ius of 20 cm creates a real image 30 cm from the mirror. What is the object uq14fw)ae m -(ehv5wsa*6gyst:by: j 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 front of a con.c6cti0y fgo5wkz(x wnxp0p.* lp-,n cave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length p0wycx(onf-0 plt6 .,gzxw5*in ck.pof 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 wa+ jqj jpmdegk3 r7-9+ith focal length 3 cm. Where is the imager jkqma +d3jjp+97e g-?

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 +.4e eox1m epbof 20 cm. An object is placed 10 cm in front of the mirror on the mirroeb4p mx+eeo 1.r'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 okm)mmqj* 8 mhvtdt: r/a x,+ z/8dbtt04-dpxr f 20 cm. An object is placed 30 ddr)+qbx 8zamr* tmtjt/m- :vdm, /xp4th k0 8cm in front of the mirror 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. T4vh13 wu;veu 7hg+qaqpq2l a-he image is 4.7 cm tall, and 10 cm ah q;hp+g47u13w qv2a-lquve from the 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 fromu nrhlfg2( *h. a concave mirror of focal length 20 cm. The object is 4.0 cm tall. How tall is2(n*huflhrg . 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. The image is 38.6 cm tall, and 14.8 cm from the mirr aq4;anhd3 mpi fwq5:*or. How far qw f3mp;q*4ia5 an:hdis 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.bcy / t4*u1plgc yfx;::vwd w50 cm from a concave mirror. If the image is 4.0 cm tall, how fl 4v yw5ug d*;bxcy/f :c:wtp1ar is it from 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 focal length 20 cm. The7 vvfmou d37 a0vleya7g .i:aofj7l0 )zc c.r9 object is 4.0 cm tall. Where f lml307az9vf7y. ugvjr7 7i .:e)ac c0 doavois 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 mir, kfyq(rn.taa) )l .k5oratk 7ror (concave mirror), the erect image is twice the si()k5 .nly,ka7 atok.ar ftr)qze of the object. 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 concave shaving mirror. If the ima;803 ff sjrvmfuhn(/bge is an erect image 1.5 times as large as the object, what is tr m0h/u(;fn8v3ffsj b he 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 mirr1 pc7v)1c;j mji efp3gl9q tl1or with focal length 5.0 cm. Where is the objecip lg9jmc7qe3; 1ct1fj1lp) vt?

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 -20 cm. An objea8; wrum*w cn9.qdf; lct is placed 10 cm in front of the mirror on the mirror's axis. 8w uf;9nc aqldm*wr. ;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 foc3(hm u/i fmt5dal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the imagu( 5dfimtm/3h e 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 fx7nv nsd ylpe-j*:rw,(tk7mz , ,l0qj ront of a convex mirror. The image is 5.8 cm behind the mirror. What is the focaxwyql7mzrj e:p-k0n(, 7nls*,d,tv j l length 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 image is 7.80 cm tall, and 14.8 cm fromgofz5 w+tvj3ah )rc9gu*lu 7 4 a convex mirror. What is the mirror's focal le*z74g gvc9fotha+ l5)u wrju 3ngth?

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 r35 dlgvyev8 5sefraction of 1.50, what is the speed of light thr585vyg3edsvl ough 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 anglvll sl;+mr1 r9e 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 air atuaw004gl qv ua -e h-:w0(gxdn 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 incoming ray is h3fb fl lx ts/):8a8sjat 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 anzvbnxnwc 4 +*gj)9u+twgdo1+f9n9s u d evenly over the surface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle of i9ucduxj+nnws 9tb o vf)4+g+ n*z g9w1ncidence 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 beneatu zi:xaq k+c 6t7cw14th the surface of a still pond of water. At what angle must the diver shine a beam of light toward thaikq t7:t u +xcc61zw4e 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 transparof2(imy(au)okg ;av ;ent material at an angle of incidence g(k )foy o(va2miua ;;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 ai -4fuzkb t1fa7r is incident on a slab of transparent material. The incident beam and the refracted beabzu-7 kf4at1fm 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 passing through it (rql9n3uifvyo*b w 58j u*;owat qb5w y**8 orufiw9 vl;n(uo3j $53.0^{\circ}$. 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 ll(jgx p+b8p/alk 40nw ight traveling from crown glass (n = 1.52) into water bng +lk84apx0l wjp (/(n = 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 refraction of 2xl(nbwa f,j 81.50. What is its critical angle of inciden8nl2( axbfwj,ce?

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 madeju3xdsio :*sa(xx s8 0 of clear plastic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guidx 3juas x(ix8:*0d osse"?

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 measured at jxbyt7:,hv 5hhjdw3 1$57.3^{\circ}$. 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-p*p:; icdgzyq 41lple :lau / from 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 diamete+p qaak*+;av5fdn xt 4i 1o3kzr 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 emergex;qo a i+n+fzt43kdp*5 v1 aaks 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 fwr6zs bbvd: h6x 5ltxw+x 8-m8ront of a 20 cm focal length converging lens. How far is 65xvwwth -+l8m 8bbs6r:dxxz 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 converging lens with fo8gn 4(e yjh8 rnuv*up9cal length 4 cm. Where is the im( je4v uhng9pnr8*u8y age?

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 i; be6kdni/*bhs 4.0 mm behind the lens. What isn bihk b/d*6e; 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 2)f ukad;z;pm a converging lens. If the image is 4.0 mm tall, hmkupa; 2fd);z ow far is it 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 f2*kza r6k,6 z,gzlnporont of a converging lens the inverted image is half the size o 26z*o lknazrpzgk ,,6f the object. What is the focal length of this lens?

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 ofe rd2mab5e:ll+3w,oj/)u zt w a converging lens with focal length 5.0 mm. Where is the o ):+rob3uw2deatz j5 l/, wmelbject?

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 from a convud(zlq 0e f13ngj2,do7u )vaz erging lens. The image is virtual udng 13zq o0a)edj2v ,ufl(7zand 6.2 cm tall. What is the focal 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 con 2 b.c: 2akl-nplzrq/cverging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is b.z cnrlclp/ kq22-:a 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 rex 1k :hxb0a6 uva6u.agal image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. Wabvaku1gh 6:. xau06xhat 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 distance xv4j2mo6a:vu gf8 ti 2of 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 lateralgv:2 omxavjif4826 t u 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 9rx0qfz c,fq9z i2 ;mfghil 9;lens with a focal length of 10 cmqhigc;i9 9rmx q0f f zz9,;2lf. What is the image 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 -fhbm;3yjt+/fmvgzv9q ,gs3at 30 cm in front of a diverging lens with a focal length of 10 cm. What is the magnificay+fh gvq/m39-f3g;b t zjmvs,tion?

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 tall, and 4.8 cm in front of a diverging lens. The imag+ec foex3 djyxy y82o;8 b+7yxe is 4.0 cm from the lens. How ta cy;+ x3o+dy2b8 xe8x7yje fyoll is 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 ima5ny7sn09jd0:d rx vkwge is 2.5 cm tall, and 7.5 cm from0 rwx:dvjy57n s9nk d0 the 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 t.a9 r:zqo,v*z*u.v(rfq an wthin lens. If a virtual image forms at a distance of 50 cm from the lens, on the s*q.rfz.v(r w*zo va:,aqut 9name 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 length 50 mm must the object b j0/f4fo(p m izhtu,i1e placed if it is to form a virtual image magnifi/if14,(mo tifp0uh zjed in size by a factor 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 35c: xh3xpoxmrc3k( 8 j6-mm cameras, must an object be positioned if it is to form a real image magnified in (rp3c chx m6x:xj8ok3 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, eah e;)vs vtw- p,t(so)q npa0k8ch with focal length 20 cm, are placed in contact. What is the focal length of ttves; optnpq ( ,h )kvs8w-)a0his 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-(m um qv273.fm5g 0 hpts+wu9ztbql.aconvex) thin lens has radii of curvature 46 cm, and is made of glas 2 mgf5.z q.tubs9l(vm+73wmupaqt0h s of 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 = 1.50) has a radiky8ntug.n d/7 vr.)k1s i*nafus of 40 cm on the front side and 30 cm on the back sig*kynf.8u.s n / tiakvn1)7 drde. 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 using a piece of plastic (n = 1.70). The radius o8;51 a bfcfw5w *zx,,odcizzcf the front surface is 20 cm and the radiu;bc1,x*cof w8 zd5 fzicw,5zas 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 fob zvzbsn1y2.)ksd 3i*o it,s0cal length of 40 cm. It is made of glass of indeds *bionyz31v,2 )b s0sk i.tzx 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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