Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of imagec9qskd:h t0w0 s by mirrors and lenses has been successful described by twqh9:sc0t k0 dhe

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 incidencee 95r mozk/,lx

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 xrtx blh8)o,0 mirrors work is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an imifafnzk p4q3c a9s9yi7/a+) i1an -fxage 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 imagezoh ofr+/( .(8.rmogynuq2f leehh/, s 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 fde4 w1c41i 0pxdq( fuactually pass through the image location, and would not appear on paper or film placed at f0w1eiq4(4fxdcd 1u pthat 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 thr7ftf rm zrgy7sc*:)l *ough the image location, and could appeag*z :7tlfrf7 *m )crysr on paper or film placed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a virtual image?r /+fbhx unwtmfwe/r) o/*5d0

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 placev5n ego.w u(k; on the outer surface of the spherical.g;ku( o5nvwe shape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which re/db6wf4(w v)d2n 6c+:ct ziuei ,rhi eflection takes place on the inner surface of the spherehfcbiwuw+ zvt ,c/ d ie n:4e6()d62ir 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 concave mirror is r, the fhavjrj 6n k /qbpi09, 1:hp0koocal 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 concavety l fq ;t,xj xbu6au3-k 0f-exb0.p5g mirror's axis, strikes the mirror's surface near its mg;u5j,ab q-t0f3 bu.0xyexx-f l6p tk idpoint. 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 ma+lnr8 cf,g6 lirror 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 a:aqtijqk 4si +v6 bm3s;wa) i:t the mirror's center of curvature before striking the mirror's surface. s+k mi:waqqs4bivi; 3ta 6 j): After reflection, this ray

A. travels parallel to the mirror's axis.

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

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

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the center of curvature is enr zhx8ck;p18oyh 5 ;,pfrx-reffo;ce p5nr-hx,8k 18 yh zpxr;lected

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 r +17(:rkrf)ut yuaxhm avv ,*obliquely to a concave mirror's surface, crosses the axis at thevx u1a:amt h u+kv,f r7(y)r*r mirror's focal point before striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

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

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

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the focal bgn+z,y3.ahf b:y b4wwi)ix 1 point is reflecteb+ 1awif,b y .4xnwgizb:)y3hd

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 duq: sr8s/ py)the image position due to a curved )pds8r qyu /s:mirror.

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 con 1m.r/gz q5vlys9 z,wazd ;.uwcave 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 concauxht.so* d( (.jskz- hhqf7- ive mirror's center of curvature. The image produced by the mirro7-.sqsfuk*z(( hxi ojd-.hth r 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 betw;g6id/xsli. t klaqy n/p+d; d++nq4f een a concave mirror's center of curvature and its focal point. The imagt4d q6xn;l;d.a+kfdil+yigqp /n/s + e 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 credp5e hc xr 7:hid*7,oncave mirror's surface and its focal point. The imagdr:dr *7e p 7ec5,hhxie formed in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror,/ 6/io b5ju0vzkv ls9a at the same distance from it as its radius of curvaa6/l j0bz/iu5v9svo kture,

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 y v7ggvr (ze4;it as its focal lengte;7yv4g zv( rgh,

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 sex6:p li -y2*b:pobplz)s gy .me a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convz2b6-sx i*opg.p): mllb: yp yex) 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 3xl-pc+ep/v e:lhd (rs 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+ u 4mgrgch80le+s ks( 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 spherical mirror produces an image which is+ 7 cly/ahy61hgmljm8xo/d kka2v 4 l2

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 xh+.0 -2jrfaai:wm oqu j ,i9gis

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 magnificati)xumdqntw.ms .b xcg: 8f,1(con 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/- c;jimi4- yh:+5( vvztm tsc rlyt1i 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 is negative, qi6zdc8+(s+ m;tym2hh8 pz yn 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 image iae0 j:nslv7 8k2ot y1qs

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 negativeb7eumk12 vv /0sjew4c vd.zz5 value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the md dnatq ;mu;w dwn1n(/t/q+r3agnification is larger than one, then the image is /nn(u /dr;da 1wtqd; ntm+w3q

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 ks360+6tbqorr 1mwcqsmaller than one, then the image i rm61q +3oskq tc6wb0rs

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 magnifi asa9 1,tlmsw; bgw/mk35a.grcation is equal to one, then the image is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastestqdp+6a5c o 8vw

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the indeo-m 4m 4j(e6d(athsbys8(qyc x 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 m82)nym*arfwpg likppeu k-: )4 z 0zs1edium 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 i vbvt9*,zq-*ejz86ed-q pz4 ov ugd4 76rxwfxs $2.42$. 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 incidenfxvw crwxfw06aw-.j,twe; vm9w*4fn6b1i 9 fce

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 bc-40 log2dininto a denser 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 wa m.esuohd, /8kter. 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, :t/zy69ya12kbto(nbe t ptv.tpl( b3 gl9e )dis 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 optich.*vx5hk,s pe7;ntl.nnw ud4 s 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 light passing from watc8,.sxl gx dw,xz:j eohf0*f/er 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 whicm*s+(q lu l,xfh lenses work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at the center c( j02wj 0daeojalled

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 calledtewdtyfm z 57+nt1a* ;hl4re8

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 k2 go 8tvd-a*ehc8i/y the center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens B is rated f ;ktvvm 0i ap,il9d )h:y0b l)9yhp,iat 20 diopters, whereas lens A is rated attpi; ,d hi vbylm )yf)a l0pvh9,9i:0k 10 diopters. The focal length of lens B is

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

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

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling paraltj3r jb,ci5l7 lel to the axis of a thin concave lens, strikes the lens near its 3ij 5rj7tc b,lmidpoint. After traveling though the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

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

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a conve *bxd jv4u4ke4x thin lens, strikes the lens near its midpoint. After traveling through tuvx4j 44kbde *he 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 thew9qc ;h1ezz37(: hdds 4dus,efd 4ddk three rays for finding the image position due to a thin lens4dfd w ds 1edd:q3 kh49;ud,zesh7cz( .

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 j ypk.w,/n2 c*2 2uvstho4*/mmwcnpflength $f$. 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 lengx3e/ 6r 7czsi3t3+ygud+f f dfth $f$. 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 focal l8 a i6l6sivvk9ength $f$. 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 fo-wjg2nkril g d-g240n3oqs/q +fhm/;t g2 cdp cal length $f$. 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 focal le z+t( t-gnbc;u7 rq73j* ai26mfsnesfngth $f$. 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. The image fox1-nrp z nj9sq;a (. w;jc*woirmed iso nx1;iajzw-c n(qr *p9sw.;j

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 cou 5ykv7vkl a;d.) 0awxncave 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 hy *xot0 i*2izglass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

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

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

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screen is place*k s*pol:t) +*xv 0p4w mbttfud a converging lens of focal leng* xs:mt4 wo0)ppf*b *ttlk+uvth 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 fkumjc,d n;/ jgd(u).rocal 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 are plfha3ri3b9b ju.je6mg4 f 7uc5aced in contact. If each has a focal length of 20 cm, how would you e3.ciu 5abref3buj hjg4f6 7 9mxpect 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 ($f = -4.0 \; cm$) 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 ay c-j-om c 4(7vq6tcu/pi8 6fl,hno4k- nwxqa plane's reflecting surface with an angle of incidence of j4o -l4 vc niq6xuf-p-(7ay ,ohqtkncw/ m 6c8$52^{\circ}$. 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 plan5e9 aj6 m6tubht sq.it3vrk ;;e mirror. The image formed by the 3v;k6a6bt .;ujt r tei m59hsqmirror appears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75p /fw9uqrn-8+oxb0gr m in front of a vertical plane mirp-bn+fr9/o 8 ug0 xqrwror?

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 approap(bygb3e) v4k ch a vertical plane mirror at a speed epyb ) g(b43vkof 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 mirrtue:* zzyuf9 .or has a radius of curvature of 20 cm. How far from the mirror is the focal point locatedf e*. u9uyztz:?

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 mirsr vq7nth 27y*ror. What is tsqny2t7*v7h r he object 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 a concave mirror, and the imagefw7 mbn.5z :oj is 3.0 cm in front of the mirror. What is the foconm w .zj57f:bal 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 mirror with focal lengtxs,,yuki0m v)h 3 cm. Where is the u ,syx )0m,kviimage?

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 len x)hj)/ufyh)aidx) l,gth of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image )lifa)uxy)h h/ ,x)djlocated?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An oay0s3ieif pu;, :ffk kq +6.ncbject is placed 30 cm in fr :f,6a ifs 3uqck;pfnke.i+y0 ont of the mirror on the mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror.8ug hh43n8i w6; etn* cbmw(at g9g)xm The image is 4.7 cm tall, and 10 cm from the mirror. How tall is the object?hme9 ) w8bt3mugn xi8nct agwh;4g*6(

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 cmhl) *7f;u/ rxwieij )k. The object is 4.0 cm tall. How tall ;rljwfhui*k)/ )exi 7 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, and 14.8 cfi;tbs qng7kma 6eu 3/xae2)+m from the mirror.2t7b ge k+ ni)mas;feax/ qu36 How far 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 4.0 cm froihlxmk.3g42an- sg+r m a concave mirror. If the image is 4.0 cm tall, howki+nla.h x42 -3grgms far is it from 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 concah 1sf9 hmgmm:;ve mirror of focal length 20 cm. The object is 4.0 cm tall. Whh9fm1h ;:gsmmere is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (co/oasm:wm ;h+w2nvu0:eu m,ml m((jmg s 8 ,wcuncave mirror), the erect image is twice the size of the object. What is the focal length of the am: 8(0mu:+/w;hm wm,eg(mml,scuv wnuj so2mirror?

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 aiv5 ;f-4)mcph m;jty egc,v9lp (8yor concave shaving mirror. If the image is an erect imagecvly(gpif j-o 9vyhe p,)4m;8 rc;5mt 1.5 times as large as the object, what is the mirror's focal length?

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 behink .csod3 4u9o0ck kho5d a concave mirror with focal length 5.0 cm. Where is the obj .9 uo3dksho4oc5k0k cect?

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 foq1r ny (o56hdical length of -20 cm. An object is placed 10 cm in front of the mirror odq51 nihr(6y 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 lengthb ,k kg6;ks9iv of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis.k9v i,kk;gb6s 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 convex8hlq:*+yxp4d( g0wpa2l juhv mirror. The image is 5.8 cm behind the mirror. What is the focal lenaxjhpy 48u ll0h:dw+ v(*gqp2gth 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 14.86hl,pk(7+i j x *k igi8tv,bdo cm from a convex mirror. What is the mirror's focal +pv8xot*g b7lkikj i,(,d6h ilength?

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.;/jj zvaqw wm;6- jxr950, what is the speed of light throughrw; /j6wzjmx av 9j;-q 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 at an anwvqgrf u 3, t(+lg)z+ngle 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 angle of42-mq2p x 5s/zwy o1l witves sv1.el( $32.0^{\circ}$, 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 wate1-dli al bff-e-(zax(r. The incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and evenly oves.e5 5ffa rpis+5jzhgv (.x8 . -phmner the surface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle of incidence o- fsprf .aemgj5n .e +(zh. vs5i85hpxf $45^{\circ}$ 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 surfqeqmy 1i+;zu7 oa-yb; 5qq-e*boy i2nace of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to zo;e-qqiymnba 7q1u oeyi+ 2 q*yb; 5-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, stri(1m *n. mlvoe;v ,lhpukes a plate of transparent material at an anohv.p nlvemu,1m* ;l( gle 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 w7h8tcnkc7) :gya6cy:(dwo7xv;ji 8 y 1iuqg on a slab of transparent material. The incident beam and the refracte 7ii :jxw: (tk6y ; gwu1n)qvcohc78yc8a7gydd 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 through+t5 bd 2-yiao-lx j;kjqs;u(a it at a dj-xu;jq 2 o;lyts-(5kba+i$53.0^{\circ}$. 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 = 1.52q,d nu*u7hcaq ed,-q-ge- x2i) into water (n = i2- 7eg ,,quud-hd *xqqn-aec 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 ohnpmsi : +6ez+s-ycy4f refraction of 1.50. What is its critical angle of inciden+szn 6+h - cmiyysp:e4ce?

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 /nns: yye5lk:0s9wtui ztd 1 .;p6 fsfplastic with index of refraction of 1.50. For what angle itsl;.:k:0t 65w nsepz syy9dn/1uff 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 su,9k3ue*u+s kii:le p4 uuix:u bstance 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 substa ag1 snqc/6 2 gnamc1fio3d*g dx4l,,nnce 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 2 o7vqok;1 m6* kdyu sxpnx-i9)0 mm. Its ends are perpendicular to its ai7v9 dy;x*pnsq -6umkox1)k oxis. 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 w isr9 8 bbainkj17+:slength converging lens. How far is the9bw: +br sksi78i1j na 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 fro 9;(uck:t4 nh7ybzxwu38u prwnt of a converging lens with focal length 4 cm. Where is 7hwnu:rz ;w3x cu98k (p ub4tythe image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converging lens, and the image is 4.0 m.n ;t er,/kzdwe7,evefn.by3v iai 95m behind the lens. 7ri weti b 5 eda ;.yezn.en/f,v,9kv3What 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.iqvb l3cxl70g23a6s o If the image is 4.0 mm tall, how far is it from the len 63 vil sl0cqob237xgas?

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 o(. . -pgv(aqqj4wthj uf a converging lens the inverted image is half the size of the object. What is the focal length of..-wug (ja4tjq(phqv 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 with focal length 5.0 mm. Whqv *sk g4t8 a(a q:x*u,*tcsqhere is the obj(,quaa k * *q8qg*h vc:tstx4sect?

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 ix,lbqv2 lpmqia / :c8(l5 tgd0mage is virtual andp05ilx, bdla28q: cv(g /t mql 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 from a converging lens. The image is 4.0 mm tall,0q(v pe *p.k z0bg*kbl and 9.0 cm .kgq* 0lv b*pkp z0e(bfrom the 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 from a converging lens, it forms hg6.o sl+ on5ca real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the fo6 osglc 5h+n.ocal 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 dism)is 8 vc 6r5syd5ua/ztance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are th i6az85yum/rscs )dv 5e 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 ofa+gh t8 sbu2vjrz12i c s2+0hstid5s l6h7. su a diverging lens with a focal length of 10 cm. What i st shrch7v+s2 za2. ush5iu2is0 bjgl 81t+d6s 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 lengb limyn+z*bci/6 ql m8;jjk0wj9/t d(th of 10 cm. What9w*0(bj ki6tq8/cbjl+ ;mi zl nyjmd/ is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in fro p.+ y7ivied*ent of a diverging lens. The image is 4.0 cm from the lens. How tall is tyi*vpi 7e .+dehe 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 diverging lens. The u27 tj0f cubdll t-yat9w/0ka,f 3+ma image is 2.5 cm tall, and 7.5 cm from the lens. What is th7 au0t -/kald0w+tl bfmufcy2ja,t9 3e 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 a-x*je,njf7n.loko/ k1 e88g jr b n/rl+db-t of 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal le+ -ljlrn8oo nfbjaex trkn b./ /1k,- *87gjdength 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 the objegh7 80zpbfwvd3 4/ ddh/u y6uyct be placed if it is to form a virwzuvuf6yp/7y/h hg4d8 0d3dbtual image magnified 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, such as is used in many 35-mm cameras, p odhnkx 619fo)6je/smust an object be positioned if it is to form a real image magnifixdo16jpf n96 /)skeoh ed 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 placed i 1p(vlioh0pnw; n5a ag6g .ms.r ns87wn contact. What is the focal length of thi.paw( o.1gs n7rv;h n sl8nia05p6 mwgs compound 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 hac. c-o0izp* z:qln il8amf3h);5jbg bs radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is the fo: 3g o.bzji; )*qhpczc-l m5ab8ni0flcal 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 oflkvoaku m)syl 4c0 gqab9yf.91 + rb;6 40 cm on the front side and 30 cm on the back side. What is the focal lengtokb0u ra v1+ ;y b6l4q9. fmglykacs9)h 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 xy)vz, v9fi 8fz-gib 2of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is th28)x-vff,9vbizy izg e 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 length of 40 cm. It iskr3a:a2e/wq(vhm bis mq6d7. made of glass of index of refra 7e /vr(bkwia: a36hqm .sdqm2ction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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