Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors and vgwr r 8 44lhcxa2u ,6kbfb91slenses has been suc48rlvh 2r 9fbsb16kwagc,ux4cessful 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 incidencj jeq98 ;l d:bagu3nu:e

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirrors k.n jg. 0cefi8work 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 thatq:p7htrcr )2h 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 imageg-g ytp(u2e2s c7.gex2/ fw ids which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually pass throbh2k;4g8djca ugh the image location, and would not appe8ka24gc ;h jdbar on paper or film placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through the image location, a/sn jspk 05 )vt6*hdjznd could appear on paper or film placed at the that vtzk s *sn/6d) p5jjh0location 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 i rdv*e+kvd-9w jhleyk 7 n 86i.q:nn7gmage?

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 s4 p3cscptlhx1,/k(n i 8aoc9nurface of the spherical shcckcs91p,8hpi n 4a(no t3x/ lape 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 pvk ta /c+rkm*,lace on the inner surface of the sphere is referr+, t/kmvkac* 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 thei9 qjs1u:b x(f) z4l:z*pexek concave mirror is r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mi0m5aome)g( h8 fk :wstrror's axis, strikes the mirror's surface near its midpoint. After reflection, this ra)awkmgm hfte(:0o8 5 sy

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 conq3+z)1km:ol eqnk l+gcj +o6a cave 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 mirror's axis, crosses the axis at.jk,e,i40 7qlt.a:fjci p rz1pwprt 7 the mirror's center of curvature before striking the mirror's surface. After reflectik 7jri :1,prt pjeli 0.apcq. z7fw,4ton, 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 y54-fa oq s5k+gjcgy-a path through the center of curvature is regy5 ca5 jyf 4soq-k-g+flected

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 obliq h+cg8d)rfk/)c-rc * qleskg5uely to a concave mirror's surface, crosses the axis at the mirror's focal point before str-)g *rk r8s+)hf cgl/kqc5de ciking 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 fgn5*fvr+d h(path through the focal point is reflectenf* dh5rg f(v+d

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 af:4/rc4otf9wuo l a-c curved mac otf9r-co:wl 44f /uirror.

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 a /j/ial50v2 q;smb /bl8z hbnxt 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 mirrorf-sgsugj+8 (ki g7g v7myv91k's center of curvature. The image producjg-vs978 vksygfu g m7g (k+i1ed by the mirror is 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 curvatur(q:sfh,u mv/dyte * w-e and its focal point. The image produc-dvsmu,t: hq( w */yfeed by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror'st ;e86gptm hu(-,l qjh surface and its focal point. The image formed in this -t(telh, u8h pj m6gq;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 asm8 : -h)dvy 2 fs8oxu.(nzkzr convex mirror, at the same distance from it as its radius ofov fxy -2s( skhnr)d88m:uzz. 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 convex mirror, at the same distance from it as*lba wrzyqd74 *hnk)- its focal len) da k4q*7* rynlwzbh-gth,

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 gre +( qbgmsdi:l,at 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 s+g(,lmb i: qdwill 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 producd0 xd kgf ;wb/-vd+zkp2sa00ce 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 prag avv(um5k19 oduce 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 produces anu.4p.; pe lg7+dzpu sm 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 anw6oe ;a y gaa3,o2j1ao 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 mir8fp cuijid v4 :g05*wxror 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 distancez /2;wtkd2a3e5loqnwc 0q 4vq is 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 upmn9m+j l18* m:i,pd u,xzaq is negative, 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,mq cqsx;j:9 suvv7)vj8k;/fm 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,3 urp3jdnl8n 7 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 magni10gxkgbz l2 v;fication is larger than one, then the image is;x kv 1lz2gbg0

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 iyr2t 52qbkm7 5 nk7vlws smaller than one, then the image ismkq 27l b5ykwr52v 7tn

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 equal to o n2ue y-9z:cnz +lkhe(ne, 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 fastestzqv/m+ -b .cyuqspx(+

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 +i/9v-s b8rr l nxxbl2substances, the index of refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one fohu8df itykm lx.d1.x, :.: qmzr 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 diamond nh8lz; e ydu72x v31bcf)mr k: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 incidenhiw18t, fh;9mmk t7 wdce

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into a denser medium is ael t4p7sa980hdl iq r4y9,ftrefracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refraction will bd-mrthqa2/ /i eu6 3arn+s6ecf40dub e

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, ssb8et(lx g t ugkw;fma,b;;7 04r52ku t rtk,is incident on a glass plate at a

45^{\circ}

angle. The angle of refraction in the glass

A. is less than

45^{\circ}

.

B. is greater than

45^{\circ}

.

C. is equal to

45^{\circ}

.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is basedcu*u twnx tf7u9;;mk 2 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 be)m03byo. hc1jwsy .k:,n lbvx am 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 work ,jrtr,(7rr(u) 5ldzvlns5 tuis

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 center callebcvijjgbz. 3oj; ( *j3d

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 are callh3a3if y(f: xcbcui )) (xfne3ed

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker at the cenb(sh6hf fut(4i ,evs 6ter

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 lenf5zetef( 3+d1r 4z9x ovx7 yhhs B is rated at 20 diopters, whereas lens A is rated at 10 diopters.yvrhzx1 5fe3t(dz xo479h f+e 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, strikesyuv --mrz hg ;u,/1inf the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to the axis of the-v u1m zri, nh/f;u-yg 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;i vjpqu8 vj;52.fj rxens, strikes the lens near its midpoint. After rx q5;f2jpuvj j8v;.i 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* u :;x* jre5wjpbfero6c90cu three rays for finding the image position due to a thin le5:eu c e r;fujc*60pw rx*j9bons.

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 foc pbzg pik6h5zei3j o-yt4:m.,al 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 focal lengt6vew v dz1)1lvh

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 lengtvd0i(d5h rmp .h

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 lengt3 t;a m.x ypax70jo6;qa;r pvfh

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 fohge ob+0q9xx/ cal 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 8 03etwrm e;voconvex lens and its focal point. The image formed ioee0mr w3 8tv;s

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by p5v) 4kzgp7fzconcave 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 ish9 dus,r na)f9

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 lam1yysl p,lglo3cq- 4l+zjvim5 v3 *m0yp 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 with respect to th i,vmp+l1 3*ly4l gjczy 3y5vo-lq0mse 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 f d.3 oltw1:b,pt+dk9pm 5o zhpocal lengths

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 ar0i k-xoxm jv77e placed in contact. If each has a focal length of 20 cm, how vj iokx7m07x- would you expect the combination to function?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens (

f = - 4.0 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 an angle of 1b7gxuyp.dshvm yz t ):6v- 2l(gx. nbincidence of .s2 t1xyxvd7nhu.pb(g:g ylb)zmv6 -

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 froeyi2/):wmb)r/kam gyprw -t:nt of a plane mirror. The image formed by the miie2 tya m:/)br/wk-:)gmpy rwrror 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 stant-ue6q 6 qtq,.wl/z( lnn8lhxd 0.75 m in front of a vertical plan 6t-xetq( lq,68quzh/nnw.ll e 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 approach a s vgken,wh tz e,;5/8ll;jx+gv3w f 7avertical plane mirror at a sg t 8;+ e5l,slvazwjx ;egvhw3/7nfk,peed of 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 cm. How far kqav1gow9uc ((3m al -from the mirror isgv- 9komu(3al a wqc(1 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 akbw4294 wzzzh radius of 20 cm creates a real image 30 cm from the mirror. 4z 9zw b4whzk2 What 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 2m86 3koyrt*f-gv hv( :znfs ma concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal leyzo sfghf(- 32rtvk:8mn6 *mvngth 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 fron 7 t6,16me7tfcqcsand pv g)6dt of a concave mirror with focal length 3 cm. Where is6gcsmv qnp7)t ,c7 dfe61atd6 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 focal length of 20 cm. An object is 0s29 clv:a)s0ojpqlu+4 i qej placed 10 cm in s240cj+ luqivoq0j9l):s p ea 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. ;pq u n;tp- 7n:kz/cnj An object is placed 30 cm /tnpnqz;p7 ;k un :cj-in front of the mirror on the mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave m/5itou 671ukdtqngk,7nki o2 irror. The image is 4.7 cm tall, and 10 cm from the m ,2u o kq/k 17ntukotngi6d75iirror. 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 of focal length 20 v1*.14dlhjl+fchk :4 jk wdwb cm. The object iswdw1d1+ ll b.j4:* vjhkkf 4ch 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 talnhwg dix1cn1 *) m9o: ipa.6all. The image is 38.6 cm tall, and 14.8 cm from the mirror. How hn*nl )a9mio61ipgc dw.1:xa far 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 mirror. If th8og 2w-nlae.a4m9 xlle image is 4.0 cm tall, how far is i.mo9wlglex - 28nal4at 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 xtkz,xaf 5/-tvjy +l(of focal length 20 cm. The object is 4.0 cm tall. Where is the image loc z(l ykx+ ,ta5-/xjftvated?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (co7 ayta);zakeh8w) ersack 4*6ncave mirror), the erect image is twice the size of the object. What is the focyahzse8*)tkaa 7c we ar); k46al 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 cobp.z1y(m oz (qncave shaving mirror. If the image is an erect image 1.5 times as large as thpm(b q.(zy o1ze 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 . h 4 li ic4i-/xxz-hbj1;goehmirror with focal length 5.0 cm. Where is the objec.hh-g i 4zejx4 ci 1xi;hb-ol/t?

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 c t*jx9 v zh/qw9k s;oide07; 5mqgqx*is placed 10 cm in frontq/9 *sgmc7tjq5x qed0z;ixh9 kw;o* v of the mirror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An objn./hx cz7xbn:6- efzp : wzhd/ect is placed 30 cm in front of the mirror on the mirror's axis. Where is the d 67x: h:w.exzcz -//hnbzpfnimage 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 m3hz.yl 0b;enn irror. The image is 5.8 cm behind the mirror. What is the focal lengel.;0nyh 3zbn th 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 yl2wy 7zqf;b j j5qq4(-ao8dh is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mirror'owhl -b 7qd(qjy4y5j2fq a8z;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, wh+)z8ua4nh*w4ri mwavat is the speed of light through iwm4r)znhi+ *uv 84 aawt?

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 aja z,+ksc j 596g4y adosm/l(rn 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 )zey2 kf7kjah)0 nue(from air at an angle of

{32.0}^{\circ}

, and continues at an angle of

{23.0}^{\circ}

. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming, p18xgamwjvutu 2(3a 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 evenly over the sup;fcg8 ek; :hsrface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle;ehfsp kgc:; 8 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. xs;immupt y*e *gn ,/:-c( ysb.bm6feAt what angle must the diver shine a beam of light toward the surface in o*c6s.n -stb ye/ibxpu;g *(my,:mm ferder 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 ik30ubtwpffxa nm33(30i, io q n air, strikes a plate of transparent material at an angle of in(oi3i0nuabm3k ft 3f3wpx q,0cidence 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 transparent 7jm *gav8; vkx r8,ku7hhk 9bfmaterial. The incident beam and jxr*vak; mg77hv8k ,u bh8kf9 the 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 indeayw erm)59e6v4 wvb:v4i6rh sx of refraction of 1.46. Light is passing through it at i4:6vsre5 h ew9yvwa6)4vrm b

{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 ligwv,v;saycr054 zt h v1ht traveling from crown glass (n = 1.52) into waterc4v50 av,vthyzr;1 sw (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 refractio)./c(dc)j m1twido h5n7 vxgxn of 1.50. What is its critical angle of incidenc/(wm iocx dcxv.)gj5 dn71ht)e?

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 clears5 )ctfhkbi-o3l 46 l l0v4tos plastic with index of refraction of 1.50. For what angle of incidence will light remain withi)slfh s4lk4o 65 -tc0vl 3biton 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-bki1r d8*ajl 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 from airgl/+t68/pu xvac,t lh 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 ana yjt9;wum 3sv8 c1tq(d has a diameter of 20 mm. Its ends are perpendicular to its axy9 cs 8qt;tjv(3auwm 1is. 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 in front of a 20 cm focal length converging lengz.) iup ( vqrwqd7g +z9mv40rs. How far is the image of this object from theri0rz9q)gvu (wd7z4 v+p.qgm 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 fud *(tt4e+cd5d *brqcront of a converging lens with focal length 4 cm. Where is theqdb 5ucd (ct r4*te+*d 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 xto(l1-cez ycw /+do* o(bn+gfront of a converging lens, and the image is 4.0 mm behind the lens. What is theg(1n(c ozt++dlw-/o b* yo cex 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 ( ms6c :xc(;-onxw zjbhn/j )ia converging lens. If the image is 4.0 mm tall, how far is it from the lens:/cswzn)(hi;xo -ncm x6(jj b ?

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 inverf)/7 u;g tokask3gz j9ted image is half the size of the object. Wha ;k3zfsg)7go/ 9 tukjat 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 focarcor** c0*zyxo oi0 /xl length 5.0 mm. Where is the objecxx/o0zr0*iryoc o* *ct?

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 i +y(l:sy)i;h e;jxtzcurvm -ln+*j e;mage is virtual and 6.2 cm tall. Whae j mrjv: +su;)zhl+e;xn ct;y*- l(yit 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 lens. The image is 4.0 mmb3(qq1 cc u zj*e; od0hmbd07t tall, and 9.0 cm from the lens. How tall is the objt 0m oqb0;zcb17(hdq*e3j cudect?

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 rwze2ut)yi(gf9wv 32converging lens, it forms a real image. When the objectfegyv9 w i2u)t(2w 3rz is moved to 40 cm from 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 307. on ebuw3u3 nps,+hrg2 .hau cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectivelya ,uh7np3oer.gsw un+2 . u3hb, 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 with a fh dil+ignj soe.9j/+2,c4mfb2nszc;ocal length of 10 cm. 2 i9+n+oh cc.lnjij s /;4sdfz,mbge2What is the image distance?

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 d q+fa7c0 m.kayiverging lens with a focal length of 10aq fk 0+mac.y7 cm. 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 ta ui g*fhd16zm)ll, and 4.8 cm in front of a diverging lens. The image is 4zu* if6dm )1gh.0 cm 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 frocsb sp.ic)d 6r+;hw;rnt of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. W+pcw6 s;i;.rc s) dbrhhat is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens. If a virtual imagee3zy 7qkf 2nyd,wo2fq;(s )pe forms at a distance of 50 cm from 3des w(qyo fz 2)pk,fne2yq ;7the 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 pjhr 7-dxj*;ap laced if it is to form a virtrx;* jpda-h j7ual 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 bdwz 02fcw19w35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a0f2bdcw w1w9 z 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 length 20 cm, a(v87k:p rfbg u,l2fd*/s mxgv re placed in contact. What is the focal length of this comm(2ls f g/bg 7dp xf*8vkru:,vpound 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 curvatc6q0 onwqdk89d 0u(v6 e4varture 46 cm, and is made of glass of index of refraction n = 1.60. 9qtk6ae0 0w(dcnoqdv 4 rv6u8 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 the fr0 r.*0mofiq)ghuh y1iont side and 30 cm on the back side. What is the focal lengt*0iih0) hfqo.rm1 u ygh 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;au*ku 6qsm p9mh55sp.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. Wah 5p m 5qk*s9;mpusu6hat 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 t,0c0 lccq3ky6g 4f bqro have a focal length of 40 cm. It is made of glass of index c4r0ykcq0,l bgfq63cof 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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