Physics Unit23: Light and Geometric Optics

1#

Reflection, refractiondn2t3g0l )eh3y (rmmt, and the formation of images by mirrors and lenses has been t n3h0d )e32y (trlmgmsuccessful described by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidenzwn, ;mcd;) y zmm88 c/v4grirx()xphce

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 woq/; ajz qutc;6rk 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 iwr5 o)hlz9gqryg92 ) bmage 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 produce72h zujw1+gi4(pbq yd34tvq3 as:hmh 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 dopd3 (plp vhq3/4lgd+k not actually pass through the image location, and would not appear on paper or film placed at that location is refervd khdg+lpl(q/33 4ppred 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 the im-czo,x.* 3rus u2ya snage location, and could appear on paper or film placed at the th*us,s.3nx ou2a zrcy-at 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 see8skp db tfd+5296na fc a virtual 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 th-m ;zthgq mq-z4zy5th7pn+ c7e spherical shape is referred to as-hm pgq ct4n -+5z7hm7tz;zyq 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 on the 0nrpvqd8fi;u 1a 0z,zm27q3hu48c zip o, mv winner surface of the sphere is refer odz7;8z qizr40ua qihm0mu2,cwn8p1 ,vv fp3 red 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 con+usd*s k:-pcxod.)m: w9 lw tlcave 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 concave mirror's axis, strikes the mirror'2,chw3wiv54y +fxakv s surface near its midpoint. After reflect c+iw4kvx25way,3 vfhion, 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 w e6g5 icn.v8zpath 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, travelingein5 o/9m3u,na3eu)sg1 sjb l 7a ,zcz obliquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After n,1zeagu /s3aio3j7l )9 mcu5, ezbnsreflection, 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 z w(1fb j:)upzthrough the center of curvature is r uzwp: 1b)jzf(eflected

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 am cs 3khbxi (w60ga9pkv/ mk(0 concave mirror's surface, crosses the axis at the mirror's focal point bef k( 3bwmhvs0kkc/pam 6g9i0 x(ore 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 rdjwr6y*u1fkl 2 m2zl/eflectez*dyku jlm1rl 6/22fwd

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 threemtt13j l x46dd9b aj(c rays for finding the image position due to a curved mirr jdx39d ab6tjtlm(1c4or.

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 conca pft7sgue b1u o5,a*k7xzo *g;ve 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. Ta m1-hgj8x*tohe image produced by the mirror ig8ha -to*mjx1 s located

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 mirroh(tkm1 ./n g0zznrg0mr's center of curvature and its focal point. The image produced by tgtm0n0 zghm(1/n.z rkhe 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 cols9 o*(gf2i5ge+b kvy ncave mirror's surface and its focal point. The image formed in this 5lbsfgve2k( +*y9o i gcase 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 it as its ra**y+ockb07 vg;8ab k05x zyatr6ixp hpxlh**dius of curp6abx;z5hc*hb * pit y0o*gvkak+*0yrl x7x8 vature,

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 distr.up8*rcv u wclu028qc osr35 ance from it as its focal lenr*2wvlu r8c5 .8quc c0 or3spugth,

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 z l()o0ikdc5za curved mirror you see 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 will (zok c5dzli0) 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 images whic;pbb0d*90pa zeqkpg- h

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 whictw5f 7(bm fmmrzr.-m 1h

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces anv,*p5 zkvc-az ,xk-nws*sca 8 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 imc1rcy zne*;pq -b *ij+age 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;jklm bs.wtomzxa0j:c pf u/ 3s9 e4.* 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 i/s;y+xtp- ic0 mhds(ks positive, 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 i(hv3pdu((ykxeq nx5 ,mage 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 posit0y-4f*cofpw ic5 (oahive value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative value, m +qzdzm0 1h(gsx0 j. nwhm/+ik;* 1 nksh9uwmthe 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 (0-gizfn mqu-/bbd wxw)2yt 1 mgo18n one, then the image isybq1--x8nd n g(im20 z /gb1mftwu) wo

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 one, then the image 9 :jzva:1ilspip v lzia9s:j:1s

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 magn 9gy a2mon)t57d(rsih ification 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 fastes )g, jzr:xb;; kc9df9nkn7tkwt

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 refra+*vja j)sjt +sction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a medium woxkwo8,:wwj4 )tu;q 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 refraction60 gf)9 yf ;xiods4n wnhr)x6q 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 incidencrnx)t;: mkg n9wr 7sk(xf7 l/ye

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 mediu wz.))qgb-qcym is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refraction willecw;9tybhcr;9tox9 qytg( )j in+1 ;e 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 c6jpbo1(aw1yw5 hc et7k-f n uyso 590,5aegh 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 bao*7imz6 jdet ,( hvpis7 wpgv 5w2de(;sed 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 fj,(rcw/t u.wbs nh7o7or a beam of light passing from water into air is

{48.8}^{\circ}

. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses+j9;f oxf nda tcbvs75l8;,eo m4r(wu 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 the c f5j:bv4*kfrvmen 4b 2enter 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 edges a o orw):lo;e3ore 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 thea1y-q0njw*g(m g sqsh lf z--c2op66u 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 2024qk,*p z yev4ig8w7:w xdtag diopters, whereas lens A is :4 e2 gtkd w84qzigwv7py*,xarated at 10 diopters. The focal length of lens B is

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

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

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave;re 4 8dnqv;:ycyhg w8 9lqvwrl.h7fn4bn./ z lens, strikes the lens near its midpoint. After traveling though the le.rhg/8; h:8eqq ln447 vyzl.b nnwvdy9w ;rfcns, 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 par buk;j oxy:.-;vhdf6a allel to the axis of a convex thin lens, strikes the lens nodx 6j ;.ak :huy;v-bfear its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

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

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding )tx gdcg8o v,dp)b*h,the image position due to a thin lens.*, , gpb )ddtvxcgo)8h

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 le5 :a2(z9 2 l uwxjvhqe+un8csangth

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 focal l0iiyr-liks 4tpgt9w,o; 9vh e2m ,7z tength

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 w .gnf*iz.k; alength

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 is+rf7,* rxe mf c/7n+ckby1rfocal length

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 focal xx0(o *9s ol avxk9/u19nbcul 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 convex lens and its focalk8k5-b gpt vt) point. The image formed is k 5pg8vb)tkt-

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 lensesl(w.e8 jxto ck+nm h v(0m5q:p

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 magnify/zpblkc w:m;a*.z5h 8 c /caqting glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

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

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

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screen is placuc;ba (ot+a b8a3c1tb ed a converging lens of focal length 2buabc c8+atat3o( ;b1 4 cm. The filament of the 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 jox1 8sebr,pup8w) sai ,i+q0lengths

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) lensf2olys6e+nv3wk2 c;ges are placed in contact. If each has a focal length of 20 cm, how would you expect theew2y6+cl2fo3gn vk; s 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 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 reflect/n02u(a aleh. mc0pjgdy 3xo0ing surface with an angle of incidence of y ax2d0l. a(mhg/0ejunpc0 o3

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 ineopln 63 wc,k) front of a plane mirror. The image formed by the mirror appears to b)36kocepwn,l e

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 o* 5s q :chg1o)qw4t x4fvgfk; 8xol(ddf a vertical plane mirro(xdd:1f;o 4ts 85wxqg4c)vk fgo *qhlr?

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 vert7z3n(; 83o .ojphrczm cism+cvk g;t0 ical plane mirror at a speed of 2 m/omg 0hrz;3czcovi n t+(3cm 8. 7j;psks?

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 mirro+96nlzen3u ewc v vfj 8r*ty5a0iw+x(r has a radius of curvature of 20 cm. How far from the mirror rcyt+ (w6lw95 u 0e3x+ai 8vn*jnzefvis the focal 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(q(zwjvq7 g0 sy:4fmw of 20 cm creates a real image 30 cm from the mirror. Wh(myw q :z0 qw(4vfsg7jat is the object 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 concave mirror, and thep56 *(hgt vpbt4+ 3e+i honyrk image is 3.0 cm in frontr+3ho ty*i 5p4bv(6keh+t g pn of the mirror. What is the focal length of the 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 im( bkr 5knzvz o9h3 t6m7l/p;concave mirror with focal length 3 cm. Where ib5lp rn 6/iv;3htmzkk(m z o79s the 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 fock k:.yn5hrv, kal length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror'kk. 5:r, nykhvs 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 mirroh: eo:5,afs yvr has a focal length of 20 cm. An object is placed 30 cm in froha o:ey:fvs ,5nt 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. The qkoh1d(* gn1(nuay0 c image is 4.7 cm tall, and 10 cm from the mirror. How tall is thd*n1gc(a( nkhqu yo10e 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 of focal length 20 cm xsny2b3yn;s4 . The objectbsynsy3;xn2 4 is 4.0 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. The image is 38.6 cm tall, and 14.8 cm from thek( kb:qfe wm8/w+zr3g mirror. How far is the obje8(z3rkfge:b m /kw q+wct 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 4.0bg xs2j22lsa6 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the mirxsa 2sg2lbj26ror?

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 q s dw;zl8/fs)objectsw qfd8sz /;l) is 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 front of a cosmet)mom2k+k 0j liic mirror (concave mirror), the erect image is twice the size of the object. What is t+ iko2)lmkm0 jhe 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 of a concave s xmz7c/p3 ;cl ush*8zgpzm:5jhaving mirror. If the image is an erect image 1.5 times as lasz7m:jp zz/pxu;5 8*c3 clhgm rge 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 mir/g5 hx91 zffjt0bb79f5,wtwb h3k dreror with focal length 5.0 cm. Where is t5gb f b fxbtwf 9r/ektw 3d1zj5,h7h90he object?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object is placedty;yhv4 n:do au5dl24 10 cm in front of the mird44u;y2 yovn d h:lta5ror 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 -20 cm. An object is placed 3.g 9 u:ape4gmmhbvr 450 cm in front of the mirror on thvme g9a.gr4b:p u54hm e 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 t2l+w*yzhz 1:sx syi r(xhd5 wh:mn ed (8hr9,fhe mirror. What is the focal length of thedy5+hzle 2nh(fwh rw(m,ih r:8x:ysz *xd 1s9 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 14.7-r fjvx54lqn 8 cm from a convex mirror. What is the mirror's focal le5rv4x ql7 n-jfngth?

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, what is the speegpac3 0- n.j f:oj q- f(4wagms(o3o-tg vd7xwd of light throughv -x -maqgj j4(nf(c7owoa d.t-p sw3 :0of3gg 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 intnx7,)u4 nhdp uerface 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 an b4mt,as4gfeph/ bf1w 0y8nu;c /2dfrgle 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.:)af.m-j. ojcpa6as x The 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 is 5.0 cm thick is spread smoothly and e *fs8bur7.bs4okgtj + venly over the surface of water on a windless day. What is the angle of refraction in the water for a ray of light+*krftj .usb7b84osg 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 a still pond of water. At what aos+ivg 0/s n8ongle must the diver shine a beam of light toward the surface in order for a person on a distant bank to seiosn+ osgv/80e 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 material at aiap kloh* g ;+u/+pis+n ao*iualgi;+ ph + /sp+kngle of incidence of

{56.0}^{\circ}

. It is observed that the reflected and refracted beams form an angle of

{90.0}^{\circ}

. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is incident ony-:hb ulc8av 8 +mcb8s a slab of transparent material. The incident beam and the refus ym8ba:hclc +88bv-racted 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 refraction of 1.46. Ligh -;cussk 0ug x:g(rhfhbkh.5 :t is passing through it at hhfgg0b ;sk.u5u(ch:srk :x-

{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 = 1.52)/yqmb; 4ipx 5n0s72e qu.d;u suo1jpw into water (nu.bj 0x4uq qmwo;s/7ydp2;ie15spu 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 1.50. What ug 2;dmehg97u w: b1bgis its critical angle of incidence?7mb ggw1d;eg 9hu2 ub:

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 p*:v3;kb/d a eyy6ehpa)o cux 5lastic with index of refraction of 1.50. For what angle of incidence will lb5a c :*doyke vxehpa63)u;y/ight 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 mvy zcj0 o9a:x7easured 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 j9l:.)rk thzlsz an:.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 5 3wzbjvt:z-c meter long and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is w:j3zbz tvc5- 1.30. What is the maximum number of reflections a light ray 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 cm focalan dt6+eakn; )(+ghr 1v ylnk0 length converging lens. How far is th6dae+0 ) k;(nakr ngv 1ny+tlhe image of 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 of a converging lens with focal leno cz hfg /gs)f9nwv+goncukr4(0t 08 (gth 4 cm. Where is the imagn/)ff c8to ozg (grs04hkg 9( 0n+wucve?

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 oxg)3r-puw s+pf a converging lens, and the image is 4.0 mm behind w)3+up g-sx prthe lens. What 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 from a converging lens. If the image is *nky v,bf-al.4.0 mm tall*l,fnvy. ka- b, how 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 of a converging lens the l:grk(vs1 p1uinverted image is half th1lvu(:kprs g1 e size of the object. What is the focal 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 le) mr00qcptuf8ngth 5.0 mm. Where c00pmr f)ut8q is the object?

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 lens. The image 0zj /ia5pi2f2stel 0ois virtual ani p/f20 ia e5o2sjltz0d 6.2 cm tall. What is the focal length of the 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 lerh(tptt87+/sj 4;de r ug.egjns. The image is 4.0 mm tall, and 9.0 cm from the lens. How talljrt7t/her tgd4g.e8+s( jpu ; is the object?

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 from a converging len8cw fu;1zuq9+r:w mb we/,rq ds, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focamqf8w+ ; cb9qzurde:/ 1uw w,rl 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 30 cdvrxtx194( anc gbc-ee8y *n7m from a thin convex lens. The lens has a focal length of 10 cne1*g9 ya-4 ( 7dn8 brxvcetcxm. What are the 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 iny7)ilkv-q em3lhb3,d front of a diverging lens with a focal length of 10 cm. What is the image distem i)b3qkl,3h - v7lydance?

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 front of a diverging lens with a focal length ofy*j,w ba iov,8s)/5jw4mli c. 7xuflj 10 cm. What is /.ljlow4bwi8fj ,*scvaui x7y5 ) j,mthe 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 8 rs m0 ng;xqi7u 7yv(rfz/e5,gd;hvscm in front of a diverging lens. The image is 4.0 czhr;g7;s 0x,i dg e5u/mf (ny7vsvr q8m from the lens. How tall is the image?

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 le-hbzi vj6t,)4mo fk0qns. The image is 2.5 cm tall, and 7.5 cm from thojz6ik)fm-tv ,0b 4q he 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 ,h- uk+bbws:/vgl6q1a ytqx ,zmiqhj.6 j9r,lens. If a virtual image forms at a distance of 50 cm from thex1y hmq/+,t.w9z ha:uikbjv sjqlq,- b, 6 r6g lens, on the same side as the object, what is the focal 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 must the object be placed if m 2.,i -5iw5bnjr k5ek)9k7k ooohyyhit is to form a virtual image magnified in size by .k5eki5 759 -boi2,k ykomhro ywnjh)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 35-mm camerasl//7hqgs6gnjh n 6*n4 urp io4, must an object be positioned if it is to form a real image mhgl nnros*4 qip/67jgn /h 64uagnified 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, eacyzbfe :1.g-l3pg f- 7kewn9peh with focal length 20 cm, are placed in contact. What is the focal length of ne- ewy7l p: p1gfgz39. fek-bthis 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 cm, and isw;byu7 *onmpg+ kf2cw*i/sb, made of glass of indnp/+ikcuysw ,m2 b ob *f7wg;*ex of refraction n = 1.60. What is the focal length?

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 cm on th 6ve 9gkk t:xw55-jo2sn*bnwre front side and 30 cm on the back side. What is the focal 5kk9r w:j-5 *xn2 ts6w gnoveblength of the 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 plastic (n = 1.70). The radius of j)2 jk5:glmwnba fz3;the front surface is 20 cm and the radius of the back surface ifa3:g kj)mb2 l5n; zjws 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 isp7ial ;pgbx d:/n0 ys0 jme0e, to have a focal length of 40 cm. It is made of glass of pe e;j py :ix,/gdlsm0n0b0a7index of refraction
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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