Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, aakj z.o4q 8ar,v,n9 rbbfv d/0nd the formation of images by mirrors and lenses has been successful described byvokdb0,n9/ a q,r.z 4a j8brfv 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 incidencear qp 1-x0hwi(f7ss ) vi )af(h9lkq6x

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 mirrort v/a:y9 +p-str;u fops work 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 image that xb wq gs5qp+/gy48+kf 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 produccm. oq4u ht:tii8:k k 99y9ntc4ug8rte 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, 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 no5w*ocz47lcg;, wj nt lt actually pass through the image location, and would not appear on paper or film placed at 5 twzjl4o*w; 7n,glcc 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 pas(:q g(gp-sn nks through the image location, and could appks(p :-n(q nggear on paper 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 virtual imageh;7z mz3cz)rb9:6w 0gjeaxj g ?

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 pf6wfwuq u4;qgz;me /.lace on the outer surface of the s/4;.w eq;u wmz fq6fugpherical 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 w/fw dmt,x ;* bwo8rs-a8rynl(hich reflection takes place on the inner surface of the sphere is refe (*olwd y;wm8nx trb 8fars,-/rred 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 curvature of the concave mirror is r, the focal length i c.(dt:rpy(vz s

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 n mp 1ewdo/3ks7ef (v3+q2wud *xl*dyulb+ f) parallel to a concave mirror's axis, strikes the mirror's surface neq u /sdvxfe+1f(w37opd l kl*wd*u3 )bem 2+nyar 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 concsgcn4ayp2*.up 0w z8l-f64icvg1 sy o ave 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 obliquely to a concave mir m-:c*woltrdaq:a 3n e16eg(bror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's tlwo*: :a(rmgc1aqd 63een- b 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 p7 22*y aeo*f3crjavz path through the center of curvature is reflecte2aypv7zr ** ao3jcf 2ed

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 mi+ kenf;oc8x6o rror's surface, crosses the axis a +oc8kexn6;of t the mirror's focal point 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 thell204upby ,t*jia de) focal point is reflected 2)ulitd 0,pe*abl y4j

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 findt / x8ovo p;gswav,+zt-l.f 3ging the image position due to a curved miroga+ t-wzg vop,/t3v8s ;lx f.ror.

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 conc7enk u8pm+ ex,a3 k5jcave 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. Tzo :zuwb(mt/lk0 osjb 59 5g7she image produced by the mirror is locatedb(ol ws z :/ousz g5b5k0j9t7m

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 curvatu+of7xtd(:.ixr.o8 bwkg ,lv o re and its focal point. The image produced by the mirrorrvkd+fol:8. ow.(,gox7tixb 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 betweet72hp6f 1sf hzn a concave mirror's surface and its focal point. The image formff1hs7 h p2zt6ed 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 convexja 7f1kc3 vfcf6 0vxr, mirror, at the same distance from it as its radius of curvatur6ca70kj x, cfv fv13fre,

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, aqe9kg -3w xi;ptn xd39t the same distance from it as its focal leqd-xpe; kx t939ni w3gngth,

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 grpfdkk dzg/+eg 1:t 45weat big you) and sometimes you see a diminidkd: +1wezftp/g54g kshed image (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 vr0ikck:u: z+bjl5 tch9 :,q pproduce 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 kmv(i.zud5c1 j39ae9 gtfk( xproduce 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 produgg 9 1 5egwuchj v+ tor37iret;mz+43cces 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 imagx ez) icqurc,1q9vixrts7 6t mz 964by. t/k6ie 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 mean) quel6z92ts rw.0xkos

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 pos ny 63:drylf- y-1elhrxtm/ k2itive, 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 negative, the neg* j5a21bpcgs.x1aimage 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 value, the image mg)ra4fg4uq l 3 bys-() :komzis

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 a3vbv+(i.bi ya 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 magnification is larger than ba* ghliaz9 x+k-qa3 ,vdfjv50jt3d+q5lq y3one, then the image isqia d,+kvjbadjqy f 9ta3l hx gvz05*3+l-q 35

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 o mo ez52hyxh2:ne, then the image is2m5 2y:hozx he

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 futdpe4 k4 6b(g2+bgfmagnification 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 fastest jl2sr5;(a,mq2wer jx

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 wapq i/ dyl/joi;*i1 53eee- srefraction

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 thal xh2 irj9 h+ucgm9pihx1sa/9xa154 on 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 7,hmkknmmn0kx2 pz1* 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 incidenceo)46 rp fvlix0a+. nza

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 mediu5x*+ ,rvshz rw0m:wkd m 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 fro+wccic h6(l* fm water. The angle of 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, i;p+ 3dd;v:8vt jfl4 kwzhljw 1s 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 optics is 76* qq0v vopf:yf(y mnbased 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 passing from wa 4d4 fj0sx)x0ilvp ;luter 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 len14bgq td.y 42gvxh+ ai r+ w(0plo0okyses 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 thick-m+qqwtbq2/s7 /lm oza)y9 ckest 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 thinno 2 ie ffob0z0:5 lpkgyl..ec; cc9fw8,ypk8fer at the center than 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 thicc gb r+7+g3sx5yk bbz1ker 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 except that lens B is rats,48 dp-+pbuh ,ie tazed at 20 diopters, whereas lens A is rated at 10 diopters. Thp+ ehs4-td ipz,8abu, e 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 thi d21 iaofo wn nbv7xhie68ob*1a5cu;9n concave lens, strikes the lens near its midpoint. After traveling thao6;1*nv f 5ibd28 ox1 o acnwbui7e9hough 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 of a convex thin lens, strikes 0t7 xse kys4k s1)4wxethe lens near its midpoint. After traveling through the lens, this r4kw01ts) x ssk 4exe7yay 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 rays for vqz ,ybcon0it8jg,9 rujl6 zj, -.sy(finding the image position due to a thin lens.8g y-i (j,qrtzo, .nyvu9zb j,l0jc 6s

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 focab (hcm*8m6i56uiv scp l length

f

. An object is located at infinity. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 focq*t48ab yz ek*pe-8((ru c kmlal length

f

. An object is placed at

f

on the axis. The image formed is located

A. at infinity.

B. between

2 f

and infinity.

C. at

2 f

.

D. between

f

and

2 f

.

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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 lenj+h iq i-eaym. ;zi58mgth

f

. An object is placed at

f

on the axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 length kh,)rr(l s x u0b/ly1i/ bb2fhqtz,b0

f

. An object is placed between

f

and

2 f

on the axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

C. at

f

.

D. at a distance greater than

2 f

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 fml 7agv0elb305 6*wd0 ojqwj uocal length

f

. An object is placed between infinity and

2 f

from the lens on its axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 conv./h711kd xlp9dubhg pex lens and its focal point. The image formed isp /7xdgk1u. lhpdh1 b9

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 cwb+l ;wnsicztf)j)soy 0t , 3tmhp,9*oncave lenses

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 magnifying glass iswiuw/nb r;rs n /(;8w4gt g k4,knug)k

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 4j7 h-i g/-hlt- v1myu8lznk dlamp and the screen is placed a converging lens of focal length 24 cm. The filament of thegz/ly --uk v18i mt ndj74-lhh lamp can 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 lenghsny0 ql+5x2.usjv)n ths

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 placed i8q vf-i uv9em3k3qk z9n contact. If each has a focal length of 20 cm, how would you expect the combinatiqu99 mvkik3 f-8 zv3eqon 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 c m

) is positioned 2.0 cm to the left of a converging lens (

f = + 6.0 c m

). 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 34u h3)lzobpgan angle of incidence of 3b zlg3up )4oh

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 o99fgtv9ieoy ,8v wl. 5gob 6hfront of a plane mirror. The image formed by the o.o8tvi,b96gfwe9y9hglov 5mirror appears 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 fro4iz cvl2h ys1pk- o,v,nt of a vertical pla2,z vso y-pck ,ihv14lne mirror?

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 approa1y m xa mt.qod,vs4a0 9j3*nnuch a vertical plane mirror at a speed o* qauna 4yxv9,3.1jdsmt0 no mf 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 radius of curvature of 20 5x jzmo9ovcb) jkt09) cm. How far from the mirror is the focaloj )59 )c09j vkotmzbx point located?

A.

10 c m

B.

20 c m

C.

30 c m

D.

40 c m

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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 pfmeh ayegy 4zv5vpqb4 2b, (.t:lk8.30 cm from the mirror. What is the o.tq:mlk24e4vhpb. 8f,v 5 gb ezyy(p abject distance?

A.

20 c m

B.

15 c m

C.

7.5 c m

D.

5.0 c m

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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 concaa4x4xdvb:x9eqo 8n b5ve mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of x:9bbvxo nx4 ae84d 5qthe mirror?

A.

15 c m

B.

4.0 c m

C.

2.4 c m

D.

1.3 c m

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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 msd3/ 1)wjm awe+mr2hsirror with focal length 3 cm. Where is the ima)w +ms/m1she 23wj adrge?

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 j g8+d c*rsp 9,42ogyoyz (a +n:yav kvcy22hmlength of 20 cm. An object is placed 10 g gpayodazmy: 8y92oj+v4c c 2,ry vh(s2 n+*kcm 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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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 20 cm. An objec3kl kl(il4,wyfa 8y .ut is placed 30 cm in front of the mirror on the mirror's axi( wukl3a,fk ily84.yls. 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. atlq 6,m1e(bz The image is 4.7 cm tall, and 10 cm fromq,a 1tz6e (lmb the mirror. How tall is the object?

A.

12 c m

B.

11 c m

C.

8.2 c m

D.

2.7 c m

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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 o(w0ddf8s fxf( 6-a gswf focal length 20 cm. The object is 4 fdf86x a (wfs-(d0swg.0 cm tall. How tall is the image?

A.

1.0 c m

B.

2.0 c m

C.

8.0 c m

D.

16 c m

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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. bqys3.32pk cwgbd( n8 2h z6uvThe image is 38.6 cm tall, and 14.8 cm from the mirror. How farby b h.uk(3pn vswc8362dz2qg is the object from the mirror?

A.

124 c m

B.

47.6 c m

C.

18.2 c m

D.

12.0 c m

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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 from a concave mirro-r ipww15deiiv /h rg.4zik93r. If the image is 4.0 cm tall, hdp w/zv3ig k.e4hr1iri9 i5w-ow far is it from the mirror?

A.

11 c m

B.

9.4 c m

C.

1.4 c m

D.

0.090 c m

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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. The ozd9uw6(;4v :vpk z otrbject is utk;6v:9 zovrpz4w (d 4.0 cm tall. 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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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in fre2b.647ek q,vetaoz tnv,5zo ont of a cosmetic mirror (concave mirror), the erect image is twice the sb65n2ve.oot4ke,7et ,zz a vqize of the object. What is the focal length of the mirror?

A.

27 c m

B.

40 c m

C.

80 c m

D.

160 c m

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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 rp(x)g2p5 cjmof a concave shaving mirror. If the image is an erect image 1.p 2jmr )p5g(cx5 times as large as the object, what is the mirror's focal length?

A.

20 c m

B.

50 c m

C.

70 c m

D.

90 c m

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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 wi:v9b 5yf ap-i)t98gekm,s p kjth focal length 5.0 cm. Where is the ogym)k-a9bkt95pvf 8s ,pji :ebject?

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 len k1qprs cz91;ngth of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the im; 9q1rsp 1zcnkage 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 0f+h9:xk mgmlx)ahf1length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image loxfhh 1k m)gl9m0fx +a:cated?

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 o4.qbk cmiqn74xnb3e i4dz 7.e/n3ueconvex mirror. The image is 5.8 cm behind the mirror. What is the focal lenn m zi /x .euonq4n74c7dbe.33kb 4qeigth 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. m 2hn-5 t,jwzw9b0jnkThe image is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mirror's focal 29nhjw,-tm zk0j 5wb nlength?

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 refraction of 1.50, wha5vb*op3y5j vl hzg9;sd2j 3 cqt is the speed of light through it? l *5c2v 3b5vdg9yhjq p;oszj3

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 in gqolzk . b)o62f/amihge,n51cident on an air to glass interface at an angle 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 at an ab -l1mz-(./ck *ofocb:fm g33qmlx idngle 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 14jrb6xcvud kq;i62 qat 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 sprey/,*vt*e+po ny fl4py ad smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in the water for a ray of /oft* ven+y4* ypy, lplight 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 oyu:6nt: .d/ rv xhguho1kuk+6 f a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The inudo/thku 1: x. kny6g ur:+hv6dex 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 material at u0hf9,rht44wrxrs *;mi- sc 4soig1 man angle of incidence fg01 t uchismihr- m4r4 ;rsx,w4o9s* 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 on a slab of to0( ,ctm 3sozqajhwt ,t+-hdp vpa1+3ransparent material. The incident beam and 3( j h+qp3-thpw1a ,dzmtco +va s,0otthe refracted 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 o/vj7ci oh y25uf refraction of 1.46. Light is passing through it at 7vuh2 5cy oji/

{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 glass (n = 1.524p*r5bt +tgkvmtk . x9) into water (n = 1.3t 9+rtgtkxpk.4*vm b53)?

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 1.50. What is its critikr*orv*i .jawg m 5(f4cal angle of inciden*.va4*o k jmgr rw(f5ice?

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 refraction of 1.50. o/ +.dcvvrm e00lay.g imj/d1 For whg0.//mj .iao1vcld 0v+dm eyrat angle 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 spbdv8j,su3;3d i d2sh ubstance 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 from0g xq;g2pmh(d4k qt;f 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 diamet9ulk g88 w+ 1w (uvfzm1ft*ypver 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 ray9vz8pw 1 gk*8lwuff1v+t(umy entering one end will make 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 cm5jb v4u niodiu)fqn8.*u cg19 focal length converging lens. How far is the image of nij.1 i*9fq8do n4gu5u bu vc)this object from the lens?

A.

40 c m

B.

20 c m

C.

13 c m

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/-ay4 cvx t4pw of a converging lens with focal length 4 cm. Where is w yx/c v4atp-4the 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 behi.z+/oy uu zkajf7/g6 bnd the lens. What 6u/z7job+y uk. a gfz/is the focal length of the lens?

A.

11 m m

B.

5.5 m m

C.

3.8 m m

D.

3.2 m m

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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 fr/-h6rx-u g.zfwzwn2 u4y ae 1xom a converging lens. If the image is 4.0 mm tall, ho- e. 24g/wfxy hnuzu16x-rw zaw far is it from the lens?

A.

14 m m

B.

8.7 m m

C.

1.4 m m

D.

1.1 m m

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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 obti t8(.t gof*9ch 5uxf a converging lens the inverted image is half the size of the object. What is the foca( 8uxi5t ogh *tt.9cbfl length of this lens?

A.

13 c m

B.

20 c m

C.

40 c m

D.

53 c m

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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.dw:8 gzpxbn+8m +p(m zav2ij( 0 mm. Where is the obj b+nzma8zw(d2(pi mp+vj8gx:ect?

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 converging legu2xl tjep7g l r(q40y3kg9;i;ba2vyns. The image is virtual and 6.2 cm tall. What is the focal length of t; ( g klvxpt023i2 eaqyb7;yjlr g94guhe lens?

A.

6.8 c m

B.

10 c m

C.

16 c m

D.

30 c m

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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 im(wwoqu g;9ypl)ejn 71age is 4.0 mm tall, and 9.0 cm from the lens. How tall is the objen7we(9wgpl);u q yo1j ct?

A.

6.8 m m

B.

5.4 m m

C.

1.7 m m

D.

0.68 m m

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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 vsp/q l*vbe t 4f8m/a7v,8gm*rl 7exzfrom a converging lens, it forms a real image. When the object is moved to 40 cm fro gxvzvavpes78mf/8 mlltq/r *4 7,b *em the lens, the image moves 10 cm farther from the lens. What is the focal length of the lens?

A.

20 c m

B.

30 c m

C.

40 c m

D.

42 c m

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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 3u-9 fbvn hquo: ;g7gu;0 cm from a thin convex lens. The lens has a focal length of 10 cm. What are thegnfuh:;g- 9bqo7;u u v values, respectively, 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 diverging lensjc dl4jipi 14cbz7;5v with a focal length of 10 cm. What is the image disjvj id ;c7p54 1zb4lictance?

A.

7.5 c m

B.

- 7.5 c m

C.

15 c m

D.

- 15 c m

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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 f, a7 lapolczyr+o l*23ront of a diverging lens with a focal length of 10 cm. 27ray l+paz,3oo* lc l What is 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 tall, and 4.8 cm in front of a mp;)cdtac s -0diverging lens. The image is 4.0 cm from the lens. How tall is the image?mdca );-csp t0

A.

13 c m

B.

8.7 c m

C.

5.4 c m

D.

1.8 c m

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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. z-8vtyd:u maua6sbe+(5y )wz The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length ofy8)aw e ms zt6vbyud 5a:z+-u( 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( ov9h4 kh6 ocuthj,m7,luc0s. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the 7huo tmclk,o,hs 4 jhc90v (6ufocal length of the lens?

A.

45 c m

B.

75 c m

C.

90 c m

D.

200 c m

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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 miosgd+c 3 q0 )jl,onfhc*o,2just the object be placed if it is to form dn*jcco , +o 3sj2fg0qloh,i )a virtual image magnified in size by a factor of three?

A.

33 m m

B.

42 m m

C.

48 m m

D.

54 m m

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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 gbg5rm1)w /lo35-mm cameras, must an object be positioned if it is to form a re1grwmoblg/5) al image magnified in size by a factor of three?

A.

46 m m

B.

52 m m

C.

58 m m

D.

67 m m

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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 len6yr+n5so)ta *2sdal k gth 20 cm, are placed in contact. What is tna) 5y+t6sdr2 ko *aslhe focal length of this compound lens?

A.

40 c m

B.

20 c m

C.

15 c m

D.

10 c m

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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 radii of curvature 46/w wivdnzx q q7ae1dy;( l)7ugpm)j .6 cm, and is made of glass of index of refraction n = 1.60. What is the focal length?ddm7x vn6lq1z; a iwe))(jwpyq. gu7/

A. infinite

B.

38 c m

C.

30 c m

D.

18 c m

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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 radius of 40 c*cpy.acaeed-2 ) wd2vf:cm b+m on the front side and 30 cm on the back side. What is the focal length of thd*a.vmy acc: w2p)d-e feb2c+e lens?

A.

11 c m

B.

34 c m

C.

80 c m

D.

240 c m

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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 plasdy3a 334 h irly;tmqw rmnx/x./ ,i-jztic (n = 1.70). The radius of the front surface is 20 cm and the rad3xih/l /d z;armyt3xiy3jq4 wn,-r.mius of the back surface is 30 cm. What is the focal length of the lens?

A.

17 c m

B.

86 c m

C.

- 86 c m

D.

- 17 c m

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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. ,. sb; r9srpiu ds a24qjyf3f- It is made of glass of index of refracqsf2 py . f43sbiaj;-s9 drru,tion
1.65. What radius of curvature is required?

A.

13 c m

B.

26 c m

C.

32 c m

D.

36 c m

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