Physics Unit23: Light and Geometric Optics

1#

Reflection, refracti1-del)h8+d e t*tsqevtfd i 7iwa52r(on, and the formation of images by mirrors and lenses has been successful da-2f7 s)tdt8ev1*l qi w(5de iet hdr+escribed 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 incidencpimi g73+4ent 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 wkt*yx-5y3cy n ork 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 4ai x2k7) gq1 xhngyf ./9ebmsimage 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 images obdn8 l+9 so 0p9(iyt9o.onb iwhich

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 a5-wgqs 9 e8zqrctually pass through the image location, and would not appear o 8wq5szg- req9n 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+ta.n m)js;tt 7scu9, fae5ev the light rays pass through the image location, and could appear on paper or film placed at the that locatiocaev5jms7 ,s)u+ t e t;f9.ntan 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 v)1 ; sdp ,qe0m8pnwwcnx,dq3sirtual 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 s5y o6i ocbgw/yn4.m /zurface of the spherical shape is referred tn5 // wyicgyzo6m .4boo 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 tawkt(y8e.;fc q kes place on the inner surface of the sphere is referred to at q(.ewk8yf;cs 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 v,ahu+poax -7of the 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 upffdx- l -u.kzm91 1ca concave mirror's axis, strikes the mirror's surface near its midpoint. -xk 1dmp flcuz. u9f1-After reflection, this ray

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

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

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

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a pat9t1(df c2m *zc/ecfa a)+gcc ufw9y;)zmsa +gh 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 0hy5a. snku jw,o94r amirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflectiw9kr4a 0aj5 n os,.hyuon, 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 aln/:qcc bs2p. path through the center of curvature is reflectedc.b p/q2 c:nls

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's surface, cros3s oj0- mrplyu**hmm ;ses the axis at the mirror's focal point before striking the mirror's surface.3* r0o-ushyjl pmm*m; 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 concavmkb;l1jezrv5xu e 7bp9j .jplof03+ 4e mirror on a path through the focal point is reflectejf9 j4ul+l 5 zo3;k. ppbxj7b m1ere0vd

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 t-zu3 hcm:da ynbl0z4j;jlygplf*77 0 o a curved m0 ;n3 *d ju ayjl 7:pflgz7y4z-0cbhlmirror.

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 conc,l.kdy ro8ctl4z6 4zw ave 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 of9b:wbi- s51l9cn mulk 6/q lwi curvature. The image produced by the mirror is l u-9snqi9l/6w 5l l1mkb:wcibocated

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 o-.sm h2zd:/y bz1*wau(d aedaf curvature and its focal point. The image produced by the mirror is locatdh/z-azad*s mwy2a1 u:(. ebded

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 situate 6fq.8yljqyr;9mc o 1+;7aecxt cma0nd between a concave mirror's surface and its focal point. The image formed in this case isqc1.fqrxy9e+l;m;j8 o 0ym7aa 6cct n

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 (5-/ea;z/ svpe)qr /f, c3afzk qsafvfrom it as its radius of es)f/ q3,5 v(azfcafea-s; z/ q/rvpk 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 lk3xac;90tgyqvd. z1 distance from it as its foca xqk;g9tlz31a cdy0. vl 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*mk 51 +rr;ybogmw n)w a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished imamnk r)ry*wgw+1m o;5bge (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrot**nj ;lsoqntz mrm 5:drja +97en 8e5rs 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 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 imaund( q gcg1yxj*h- 6qca4v1m0ges 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 producesg 7yfvn o+ 7y)tdqa(v2 an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an image which isptv( (ud3 (;c+ mo(px nezh-9/poevta

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 magnificatioj9bwrxs-kby)m-ie35 io ns:38 i nc u*sci, 2un for a mirror means

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

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

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

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

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

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, the imag7/hmtr g:0l0x 5f0 cxqq bkq98 sxo*npe 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 image forme.lrddc / vh qhy//x669h*h jvsdza1r5d 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, gilc:3x6 lyt m6c6m;z 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, thh fhho nq615/ep;t l)a)eabz2e 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 i ru8tv-j.)sj magnification is larger than one, then the image ist-8i s)ujr.vj

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 cyv7: *p2lvu h au 9shhl**+ n3fzcs6zthan one, then the image i+zpslu*9vhch 6cnu a 2zy f h:*73v*sls

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 one, the) sfmzl9 rthm f7ll: e0lx2:h9n 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 fastest2gxknbs xn59zgo-mtl7v35f+

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, q-fe,t6ld4h n 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 for a medium would imp:c oqbgas-4mv8t;hu dsg,0 (o8ef)kb7 qq- gply

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 diamonnrs+uak n43+ vd 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 incidencym) j-bwr m)jy jzc922dl7/( gn7eslfb fb +t4e

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 medit3lrit) 3mn)zuf v+)n3 bai5 wum 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 refractl23q2m fipxh9 ion will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on a glass pf)ojoz2, (6 ow(qang0 upg.om late 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 based5:5e o5xbqi d-di4md o is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing from water intzw5)jk0bl-e :x x;nmmo 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 worad3f,uk.3+6n+ f c rzfmurv 7yk 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 center cal9b1v w-opu6ajled

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 xod))u r*gyl+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 toi2u,rlz 0e :she 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 exo9,fs: vu9f kncept that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal lengun kfs9,9ovf:th 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 ofa e7ctslfi +5bv.1h ez xl;f/(3u(ma r a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquelu 1c .ll/si7f+;3hm(vafx rae( bte z5y 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 thwv (3iy d)qy t;2r6pfrr 4zr7bp1nl(s in lens, strikes the lens near its midpoint. Aftw p6 t( bzr ) 4lf3qrrd(rys2i;1vyp7ner 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 thre2j ycv559sqs ae rays for finding the image position due to a thin les5v 9j2cq ysa5ns.

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 lengthp4bivie vb e1c -ux/.( $f$. 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 focawf) ib:7n wxo9b-k*o +yuzyoi6s6)ucl length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focals0 u.gxb0d* exii w3*e 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 leewwr 3 bjw425t zjbrd. cd5tc*r13ic 2ngth $f$. 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 foc 4gh89cvds m/ial 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 convex lens and its focal point. 6 txy,nxgkwa n0zx 0q1+kr9s,wnw6 7 lThe image formed iax6tql7r x9kwsk w0 n,,xz6y nn1wg+0 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 concave lens bvd- crwi47b3es

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 magnifyit92i+oen zas o*t(+6rx .qa qdng 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. Betwxlq7dtu( 39kw mvb q -3d:iuw g9p8v4jeen the lamp and the screen is placed a converging lens of fwwjvtx:pki u3mud lv4789-(3d qbq9 gocal length 24 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 lengths uj6 gu (gc-a4k$f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) lenses are placed in bmcv3nu 8j.2; ;n(rqvoj :jcm5a( cyccontact. If each has a focal length of 20 cm, how would you expect the combim j;(y.qj8;comjvrv u3ccc2a(5n:b nnation to function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an angle of wq;m 5xryo0w :incidence of 0wx :wq5ry m;o$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of a plane mirror. The imr,r(2sxzd3kpc2ypp s7g 1r t0age formed by the mirror appears to becgkx3zppds t0(r 7y2 r12,srp

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 frok99:qmigi /s1t z6f oant of a vertical plan:gmt6fks /9azi1i q9o 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 vertic .0t+a5y zsj+)katmwjal plane mirror at a speed of 2 m/)sjam.wzt5+0ak+yjt 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 lsn84g zkki*2a radius of curvature of 20 cm. How far from the mirn *4l82s kzgikror is the focal point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm createsfxqogh h1: 32 2otx,gc a real image 30 cm from the mirror. What is the objecx,th1 2gc:q2o o3xfgh t distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of (bojh7d2 r u:qkgia0o yx) 2p:a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal:0i) opxyodu2j ha(7: rgb2qk length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave n;/m1yhfc/+sk pv n4wmirror with focal length 3 cm. Where isnmwv4/+cf1s hn;/pyk 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 p*uks, h84rgk1ql5 oum laced 10 cm in front of the mirror on the mirror's axis. Where is the image loc*,4 r quglm58uk1 khosated?

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 fo141 (2meiqs f.2vnimdst lh6qcal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image located4iqmsv 2 1ln 6fe2t1hqd .m(si?

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 imaa6h5ta1:tp wcj./cqwnw4h *fl :wpn8ge is 4.7 cm tall, and 10 cm from the mirror. H/c1*8 hj fannatwwp4:6 tlpw5.: hc qwow tall is the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a e5rm;agdt n:-o moja407z:tt concave mirror of focal length 20 cm. The object -5t7:rjedz;m ta4ogo t0na:mis 4.0 cm tall. How 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 tall,2(qj++ al :72wcn9c rngawhb i and 14.8 cm from the mirror. How f(+ wl7cgbaah+w2n: 9nqric 2 jar is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4lpf;/dp va9-c:xt e 3s.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it f-3/9dfcxp:;svpt ela rom the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concfk 7v-16uj rvb( x,wkkave mirror of focal length 20 cm. The object is 4.0 cvrkk-b v6k uf7x(,jw1 m 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 6kyikkp 0 -rfl xe89-ta cosmetic mirror (concave mirror), the erect image is twice the size of the object. What is the focal l y9 xf 6pe-k-0irtklk8ength of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a cobdlwa4- 4: gpn.af )m m0sulwz)9q /hlncave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal leas9 :afm)w-l u4hpd4wl/)n0lq gbm.zngth?

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 focal length 5.0 cm. Where i7xjfz4avdes(9i02sve +- xw is thefzd a24 jiesv -0 vx(9x7+isew 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-2n+-f6dvk m4 kh vd1yupzgh; a focal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirr62phd4g n-d-zvkvfy 1u;hkm+ or'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 hsy8 9th4zyw*u as a focal length of -20 cm. An object is placed 30 cm in front of the mirry*ush zt 894wyor on the 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 idsoo: bh27mgw6nx/b 3 s 5.8 cm behind the mirror. What is the foco6m :/wh s2xn37dgbboal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm talpvg aj(1/ sweqxwavs39 6s j1-l, and 14.8 cm from a convex mirrogxj9aqs sw1ap13vvw esj/- (6r. 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, what is the speed of light *z;l v:w jw w+b0)ruyathroug;+w luz) 0jyaw:wb* vrh 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 i-q*9xj i2b:u.ssb exhnterface 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:rmk:(4n.lks:iri hm lr0vi 4 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. Ther6 xy- r3l8q2xatr +lp 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 evenly over the surf 4tx7wnz*n ,pv8* rdhq ywjr0o;+w4: ykv gaz-ace of watxwwqap44- w:v;hn7k0zzt ,+r*jdon vy 8rg*y er on a windless day. What is the angle of refraction 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 the surface of a still pond of wate/7 ad h2g2s0v8hirm6owzcm0sr. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The a2ov/8msrgs 7whhm 6c i2d00z 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, ed 1qco 9ay9s; ,p3kzxstrikes a plate of transparent material at an angle9 9 q1po3kec dz,ys;xa 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 on a slab of transparent mate dnlj3r1 m-vt n19yvw6yeb93hrial. The incident beam and ey 3-3m9nvw9jh rvnyd 6tbl1 1the refracted beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.46. Light is passing thr:g;wuj,c;uv* c2tw merrnx . (ough it at wt ueu; (,w .xg cr*cnj:rm2;v$53.0^{\circ}$. 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:.ik n dctxwx.i 5r2)rvklj(9 ) into water (n = 1.33)k v9k2l(x )ij:c.intdxr w5.r?

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 nmsevm+.g (;gits critical angle of incidence?mv(gn s ;g.e+m

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic with index of refraction otpj81.z t2q-olib*fnf 1.50. For what angle of incidence will light remain within the plastic "guifp8n2zo- *qj tbl1ti.de"?

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 fobrr.gji+ ,/ewr a substance is measured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substaom;kb d5 9iyls-:qcya0rbl5c,7ah+ mnce 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. Its endsgd 7oas,9h)ok are perpeogk9) s ,oa7dhndicular 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 in front o;x,h8:j0quz ak ary40+ rxfnnf a 20 cm focal length converging lens. How far is thek nhr; +n40uj8,0x q: azyxarf image of this object from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging ljqx og437c,uz ry;e;1:vg* oerkpm (iens with focal length 4 cm. Where p o3 gzq;m7,uev:r14oyg *kcx ( ier;jis the 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 frxvjlz )u4.tu3u. zn7g ont of a converging lens, and the image is 4.0 mm behind the l 3.z7jvx4 uult u)zng.ens. 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.xe;r0e rx w3wm(x wi6( If the image is 4.0 mm tall, 63x rwer(xx; 0ewwm(ihow far is it from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the inverteviy fm:p 2g,uim*1bo(d image is half the size of the object. What is the focoig1(,up2*vi: m fbymal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens zdqm,d6 u1p 5swith focal length 5.0 mm. Where is the objecq1ps,d6du5 z mt?

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. sz a,k:s8nla*The image is virtual and 6.2 cm tall. What is the focal length osza ska,n *l8:f 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 fro :d/h y /ayfg66+tjwhvqd -6kvm a converging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. Hdq jvfwhtg6vy6d k-:/+y6/haow 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 from a converging lgm xw8ppsv71tqn8);h6evwtfec y:(- ens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm f (e wm s ;c8: y-v7)hwpptfv8x61ngqtearther 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 diepx/y8q na0u 4stance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image8/uxy en4p q0a 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 focal lengtb+y,l - hfd+nlh of 10 cm. What is the image distance+h +,lyfdl -nb?

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 di,-u- k )avxkdwverging lens with a focal length of 10 cm. Wh,ku kxa-) dw-vat is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, 6bf, zkkcu+,iand 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. kz+, u kf,ib6cHow 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 frog cpyb+p h;* ar/k.vfwdu 5f).o lf-u,nt of a diverging lens. The image is 2.5 cm tall, aruapp .f5) dc-u ;lwbovg, f/y*hfk +.nd 7.5 cm from the lens. What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed ate e/5f8/ ox itz zbxc68 rsmvly8-d59d a distance of 40 cm from a thin lens. If a virtual image forms at a distancsx8y dxf/8 5 eer 8z- vci95dt/lzm6boe of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must t0guc1x0)jv 2d/w cvrrbha0hc u /*o, whe object be placed if it is to form a virtual image mxjc a/0 bwvcr*gwch20r 0u1 vdh,/o)u agnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length lens, pr6-b speyl iqgo ee+7z(k86;such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a factor of three? pe y6z+rle ;p qieo(s-kg6b87

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, eaf,p p.j7x7:iozz ghwc/sb 5 snj8 2;nich with focal length 20 cm, are placed in contact. What is the focal length of this compoun:pw pnsi2sc/bg x5zj 877;oznh,.ijfd 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 radt e1dostu,+efb8 .- acvgp 0*q1bk4dzii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is *0 1sba-dv f4qt8ou pebe g+1z, cdk.tthe focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) has a radius of 40du((2 esl.qvq /c7xuw cm on the front side and cq7lq/xe 2u.d(vus(w30 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 formedfrl 2d yb y n1ok(xld-jb( 9:k2u*(jxd by using a piece of plastic (n = 1.70). The radius of the frox*x bo1uyj(nkr(yj (2 9 b:kdlld-d2fnt surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal lengthe:, t-)e/ u.j y0xwaligq*mtu of 40 cm. It is made of glass of index of w-l:t/ea0 jt ,*e)x.m iuugqyrefraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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