Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images byegdc1h.vt9h usn x2 +8 mirrors and lenses has been successful described byceu89vg t2dhx. n hs1+ 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 incidenb iye a-cb49f+v)x9k/ckc kn:ce

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 is6k9b1cd 79gwz h 0chvb5ko.hixso; z(

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 imauvc f)94e 7 lq1yjzd.sge 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 idj+vsp-v*q (a mages which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually 9bqckw9m,nn7u v*aa* pass through the image location, and would not appear on paper or *kb u9nacmq , w*97vnafilm placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through the imagen tei zl2;*alxcg ch xn/8ga2*c5yx4( a3ig; c location, and could appear on paper or film placed4ce22yx( *ll;aa/xh ;ggn nccz3xi a* 85i gtc 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 yy+ y,x2p +: 5x1puem6rkpklw 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 ofwnfoq ax(0 za1+6eoqxa8 ,s :t the spherical shapewa:qa o6q+1fnox, 0t8 (zxs ae is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner surface of the s223y26d/,q lomw 1y vnqo1ree kv zfb8pheyq3m6 eb1,d28r1fyveolk wq/ n2z2 vore is referred 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 con9(pz+t j skkwa;go *e+cave 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 mi, z4adwgo5 fu8hcx(y2av2 8qwgw.wp .rror's axis, strikes the mirror's surface near its midpoint. After reflection, this ray,qy.w8 d a8 g5o4wg(f.w 22hcvaxzpu w

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

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

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

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to ther7 qos gmt1bpvnl 4nsf49mc5.yt y5 1; 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 )x z x+nsx4d 2fx7af+b(po +hga concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. Afgsn +phzf (xfab7x d2)x o+4x+ter 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 ce v(oi8k+q*fgknter of curvature is rq8 *ik( +govfkeflected

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 concaveujlu+q tpvp+cr9y5 0+ mirror's surface, crosses the axis at the mirror's focal point before striking the mirror'sq uu+ 5pc0r+ptvy 9j+l 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 o8cg y+-6mrk-i(,gjhk39) vufru u sdln a path through the focal point is reflectedi f9uysc v3gk+m,86l ukh-ur gj( d-r)

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 position due to eecmx3oj 923k;ygfm q.46nasa1q j y,a curved mirrormja2nomye4,3. qak cqg x;fye6 3j 9s1.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly at its focal pf+k2mv0bx6 ,(dx z trvoint,

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 image ,2xt-xpq,s 9 ((veptgu3pi-s0xnp ehproduced by the mirror i-2,ngt9xx(-pue s30qxvphse( t ,ppis 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 mirror's center of curvature and m:z)npwg3ag),,*:na ( hp k fhcct7ikits focal poi( h7c::in) p kgg),3kt*aczh mfa w,npnt. 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 ep 0b hae:6jqh/jg9y) concave mirror's surface and its focal point. The image formed igye/ bq)jp:jha 6e0h9n 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 5f)j + -rlxmj8 tghcxoxk5z3u)u +m3n distance from it as its radiu3ux 5n5ch fxj m-omk)l83r+u)z tj+g xs of curvature,

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

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

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

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convxq gs,p.*+2dn qao7wpex mirror, at the same distance from it as its focalq.7w+2,d appsnx* oq g 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 (j(/mldw- j p)exbqs/pi.5tdm )to8v(a great big you) and sometimes you see a diminished image (a little you). If you look at (xmq5p)/ st8 /vpmo) d.dij b-let(jwthe 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 producev8pg b-rd-2hf 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 mirm()c+uov; c,w: 1yk svfs2fckrors produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave sphericalz:)l yrqmi98n 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 sphericawh2,bwh bc 1c +oaw/cpf5k7 p9l 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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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mirror mbz2+ dusqz-s9ma du4xu2m ,*q eans

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

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

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

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

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

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, r) sg*btg:p l)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, dxa hz16 4ipp(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 value, the imgyq s-*j,twuv +li81yage 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, the i5cex,vpr:epm:ga pm,1rin( i/n h ,irn7xd52 mage 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 magnificatiom 1yfw/o+or hjfz )5t1n is larger than one, then the image is+jtohow f /1m1zy)f r5

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 tz2txb,:g nwdb 4-w j4than one, then the image i4gzx2ww-t ,:db jn tb4s

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 eq sdtf-;5fg b8wual 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 fastestr4ru ;s dy-ymo5h (m1 hnn(dl)

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, +m / mw xusv:.fh5m4acthe index of refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a medium w ;3i3:h d8ppe f lacevs6juj*.ould 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 diamond isg0jg qagx ;/lfgr/d/ j n.8o.,e i6 b0e4xblyv $2.42$. 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 inciden1*tgpbh9i)yc +o :*gc- psrtece

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 d vfizjv d*f4:h)s 1tofs :-n5senser 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. a ,mr9gz;v m 0s4uwfduwzzj it2(.r,, 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, is incident o yoyn*-lyfk: :i ,*gdjn 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 o1 aqms3 ,/fo,lr dtw qg7ifaw6yp 8/(jptics is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of ligh56io1b h7xqd3:;jqul 0timw jt 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 m 8y(8y)iyegv 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 thickjr, i 8qs .s3l(alnx0f(1pjgg est at the center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the fjqe vs)g-znj 3nf vj6p) dbub9(74z/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 thicker at t7 ag1tj9,xrl qhe 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 lensesa4qzv(z3 k nz. are similar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 da4kzz3zqn.v ( iopters. The focal length of lens B is

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

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

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave lens, striken821 er;m/5j;)syhq bzgtznus the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliqueljy8n 2 nh s5urtm/zb1 ;g;qe)zy 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 l*cr e v9tmfz5*9av /haens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the 5 f9*emr/* cza ahvv9taxis 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 fo,jab2p8a3 jid r finding the image position due to a thin le 38jai dj2bpa,ns.

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 leng7 ;55mz 3(xo + zbrzgzyrn;xrxth $f$. An object is located at infinity. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal length/ 0y8sz;sigpn $f$. 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 fymn0nec yz3 .bakbp;-;,mh6o ocal length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lengaf.t6.lk8 y yjth $f$. 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 thm( 1jishz/1focal 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 c wyoniyl9(o-x n jzy/ea 2.v;)onvex lens and its focal point. The image formed is2l-)v a oy9z(w;xnjo. /yne yi

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 concadwr1:y6z ;(8z jox xlqve 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 throughx ,z*cpd(.usskdk vt 70e;l.d a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

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

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

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the) un/:wclh iqm2)wnrr d7-rn zkl4j. 4 lamp 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 the lens position is varied withllrzk/ -7injrun:w). m)h wdn qr4c 24 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 lenghtbgjf7kqj hkkusnu6 v ,/3/,-4f t+iths $f_1$ 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 pn u7cu4xr) ibzp-37pj laced in contact. If each has a focal length of 20 cm, how would you expect the combination p p7 c34z7u-rb )xuinjto 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 ang q, l.su *5ijgup6b5uvgl3s;x le of incidence of 3lpu gslv. gi6 u*q55,jbsu ;x$52^{\circ}$. 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 ;b1*-odk/* oq5goo,nqytbt v mirror. The image formed by the mirror appearsqbtodo*k-bv og;,oy5qn t1 / * 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 yourardfmvw:3(te d3w; ;i image when you stand 0.75 m in front of a vertical plane ma;3 ;widvrted (: wf3mirror?

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 akh 8wbn/*3ezwrmwhvn*43lifr7 2 n b9pproach a vertical plane mirror at a speed of 2 m/*wnl 4hwr2n3bmih*3er8fvwkbn /7z 9s?

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 radiuseil0e g .0/53by zrqlb of curvature of 20 cm. How far from the mirror is 3 g zy5r0ilbq/ebl0e.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 radius of 20 cm creates a real image 30 cm from the mirrrd;sd jo t-s/w.q,m 5f)tsz-v or. What is the object distancetm,d zs;j.w/ds-r -5 fq)stov?

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 fro g.5 f9 vu0vo v:vjqbkf*k/c6tnt of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the m ft*vu5vg bck/.:vq j9ok0 v6firror?

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 i.:vp sxbt)4xb 2u z 7/quyaer6n front of a concave mirror with focal length 3 cm. Where is thebpvuseq: yz2 7u4bt6.xa /x)r 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 mir-xt:6. ,seaxsvr u.7;xmiuj aror has a focal length of 20 cm. An object is placed 10 cm in front of the mirr s.xe:s xx7rmi; aut,v6-auj.or 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.6 ert,/pt.ur q-j.)fkz p9pxh An object is placed 30 cm in front of the mirror on the.-/ 6qhz 9txr pru)k. jfet,pp mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. The image is 4.7 cm tall, anoo ci4jg :iq25d 10 cm from the mirror. How 52ioq c4 oij:gtall is the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal length 20 c0.uu47mmt pxjzll *5uo j1f(e m. The object is 4.0 cm tall. Howe mll4(0t x1pujufo*z57m ju. tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tal:xm qm:xm7xt 9 e3xvk6l, and 14.8 cm from the mirror. How far is the otv6x ::qk7m x93mmxxebject 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 4.4*yf)8c;kfd nziyu)yv0i*m ac21 ejt0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the myzv4n cmcfy1i2id*t8u)ej*;y k0f a )irror?

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 fro o4cf9eo;.c 2mfo: phk7 dxc(9 le8tcfm a concave mirror of focal length 20 cm. The object is 4.0 cm tall. Where is the ima(; o:kx7 4hdpmf.8 cctle oc cffo299ege 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 fr0 otmq+.tm8r uont of a cosmetic mirror (concave mirror), the erect image is twice the size of the object. What is the focor+tmu t.80 mqal 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 ce*2d8nn43k)scbph kso,o.ns m in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?),be3pk*.snd socn2 s kn4oh8

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with ;wyaxlg(a:3vf -,tfa :ihbz1 focal length 5.0 cm. Where is t:hvl 3a;gf -fy,1at:zwxb ia (he 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 i6iq/aq v -x x7)v/le 3cqjf2k, nckyaja5x(g (s placed 10 cm in front of the m(jqlx,qk6av( 3cq2 -xfxycg/ ak7 )an5v/iej irror 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 objb-w0 6vhy: )f(es 4vyl7pgczi ect is placed 30 cm in front of the mirror on the mirror's axis. Where is the image locateyil-cwfsvev7y(: ) h46p0bzgd?

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 conyo/.tq38 xkp5h/ ebeivex mirror. The image is 5.8 cm behind the mirror. What is the focal lengthi t5k3xyp.h/ /eoqe8b 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 from a conve o .u my/ nqof3iyyvqd21s1/)kx yq1d)/oi /y3uk1 vqmso2nyf. mirror. What is the mirror's focal length?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, un +a a.0lpqg:azf:p: what is the speed of light thro0:npa:qz pu ga+.f :laugh 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 atg;r332/ lc)ajrgrzvp 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 w8w v,)w rtuj. 96f(g0o wtfgfangle 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 incomin*n1s,/nu ;.buk,e9z hljt0edgrp 4dpg 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 an84,vs+t n v8emprqlp/u 1qsp:d evenly over the surface of water on a windless day. What is the angle of refractqus, +pv1m pp8 qle /s8rtv4:nion in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath thej xn8;),o6h( ba eakut surface of a still pond of water. At what angle must the diver shine a beam of light toward the 8)b 6t a;xuojh an,e(ksurface 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, strikevh0qghts9uk*3t b *a0s a plate of transparent material at an angle of incidence ofghk9bhtq3v0 ust** a0 $56.0^{\circ}$. 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 transp.t r7ai, ew9 rpohm8y9arent material. The incident beam and the refracted beam make angle,irw9mh7aeo98tp.y r s 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 refractioo9qm hj*1j*ofi8l k +on of 1.46. Light is passing through it at of1lq+*m89jkoj o ih *$53.0^{\circ}$. 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 . ceetp( 3sp;5gv h6yhangle for light traveling from crown glass (n = 1.52) into water (3thspegphc; y (6.e5 vn = 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 is hd,djbzbmq5ct(b3xr 8/96t x its critical angle of inciden5hzc/r(mqt d xb36bb8td j9 x,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 made of clear plastic *l p(jfe;ul7q8 xoc8stygdl/ (e 7f x;cni1w/with index of refraction of 1.50. For what a(lw/f 7lnuyiq8(;cxlxd /oe * j etsc8 7f1;gpngle 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 substance is measured as9cpe7m yv jigw 0p08q93y1igt $57.3^{\circ}$. 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 substacrm9hq 5*(asmnce 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 diameter of 20 mm 3*kkc 2 c6ge5v bihy1cro7.uh. Its ends are perp17hy5h6 i .bukrgvec co3kc*2 endicular 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 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 i1pt2 pzxwx95v n front of a 20 cm focal length converging lens. How far is the image 2wpv1 tzpx59 xof 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 lenscd3,z2ay sx4q/f cz 5v with focal length 4 cm. Where is the ,3c4 xczaf/q yd5vzs2image?

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 behicwice -t7 6 d:pu(- h3bqbpu1ynd the c1wd(-7 cputhbu-b p 3iq6e: ylens. What is the focal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a converging lens. If the image is 4.0 mmm(n8za n i49xnen:a bcp(8.av tall, how far is itn.9eacnb: a8avnx8i(z n4( pm from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a conx0 )-7at dndd b6rb6ehverging lens the inverted image is half the size of the objdxde ha)06 6t7rb-bd nect. 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 inq yefn5)4lag ; front of a converging lens with focal length 5.0 mm. Where is the obj) 5f;aglnye4qect?

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 ld+hd qrhr1w5n; fu:o1 bv7 z;cm from a converging lens. The image is virtual andho:7; wlbuhr ;qdr z5n+f v1d1 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 fromn11hy dk f. 9vpu/nn2y a converging lens. The image is 4.0 mm tall, and 9.0 cm from the9yp.uny1 nf k /h1v2nd lens. How tall is the object?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm)et ae21 8mzrazj l+sha b)/9c from a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the imagjea a+ 8l9thr s 2/m))e1zzacbe moves 10 cm farther from the lens. What is the focal length of the lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 cm from9td;hsun q))zd-f-t m a thin convex lens. The lens has am )9tq -n;futh-)s zdd focal length of 10 cm. 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 in front of a diverging lens y-2h)9udn:fv5 u lj vfwith a focal length of 10 cm. What is- j2 vlhfu fny)uv59:d 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 at 30 cm in front of a diverging lens with a focal lengks5w5b(r i ukry1gxmb :olcvy3(,.9 fth of 10 cm. What iry3m 5fwi.r co5g (slxb,uv(k:9yk1 bs 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 diverg0j 5c ejvmd3ggotkz7(r(5 : xzing lens. The image is 4.0 cm from the lenk50z (r:e j7(g5omg txjvz3d cs. How tall 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 t xb9;v h*iqazlhz09m.:w1j o diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal mo9 bh1az *:xzij.0vtw 9lhq; length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens. If a virturl- cm-er/;ml al image forms at a distance of 50 cm from the lens, on the same side as the object, whc/r-e m;- rllmat 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 o 2w dbp9kskp/; y*+wtmm must the object be placed if it is to form a virtual image magnified in size by a factor +bwwsy 29p*/opdtk;k 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 ilfy 30 1yk/c-*uwq0n jlzhhp8 s used in many 35-mm cameras, must an object be positioned if it is to form a real ima fylwj *-hu8z 0cl3yhq1np k/0ge magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are place /t arbpk10lsi ucm(7.d in contact. What is the focal length of this compomb 7ui0 kcrt.p(1sa/lund lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of 0ovbuz4 w;gp5curvature 46 cm, and is made of glass of ip;bvoz0 u4w5gndex 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.yqs 70v41bv hp.qdtw+jwjj.3( +u lxa50) has a radius of 40 cm on the front sid (p1u0jvs j q4l..3 jhvxy7q+wb+a tdwe and 30 cm on the back side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.7)dyjwch6 d4m )ip w*6y0). The radius of the front surface is 20 cm and the radius of the back surfacw6) )w4pmjd cydh i*6ye 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 hagl c 53-wpzw-mve a focal length of 40 cm. It is made of glass of index of refractiw mz3c-wpl-5 gon
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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