Physics Unit25: Optical Instrument

1#

The length of time the shutter is open and the8cjx7cahlv9/ bgt5;k film is exposed in a camera is determined by j8c9agx cv7l / kbht;5the (1.0 分)

A. shutter speed.

B. f-stop.

C. focusing.

D. none of the given answers

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2#

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The amount of light reaching the film in a camd.1d1 rtxtx 7 ypbe,2ao5-qgwera is determined by the (1.0 分)

A. shutter speed.

B. f-stop.

C. focusing.

D. none of the given answers

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3#

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In a single-lens reflex camera the lens-film distance may be pvts p j +3h().n.i(grwbr)u+b )tcrx varied by sliding the lens forward or backward with respect to the camera housing p +is3b(xhupt.j)gc vb( ))n.rtrr w+. If, with such a camera, a fuzzy picture is obtained, this means that (1.0 分)

A. the lens was too far from the film.

B. the lens was too close to the film.

C. too much light was incident on the film.

D. too little light was incident on the film.

E. none of the given answers

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4#

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A camera lens that coverj .h/i,(qqrncvu/e o17 0xzqas the film with a field of view that corresponds approximately to, av(ji ozn.70/q/ rh1xqcqe u that of normal vision is referred to as a (1.0 分)

A. normal lens.

B. telephoto lens.

C. wide-angle lens.

D. zoom lens.

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5#

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A camera lens that acts like a telescope to magnify images urms i:+4+ f,ok;hgb ois referred to as a (1.0 分)

A. normal lens.

B. telephoto lens.

C. wide-angle lens.

D. zoom lens.

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6#

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A camera lens that covers the film with a wider field of view tha-yd 16qagt7tg ss v)s0n that of the eye and through which objects appear smaller is referred to a vq 6tg7s1-ds)sat yg0s a (1.0 分)

A. normal lens.

B. telephoto lens.

C. wide-angle lens.

D. zoom lens.

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7#

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In which of the following ways is a camera di hghqpj/q5gwp,8e9nk4u 5 n*jfferent from the human eye? (1.0 分)

A. The camera always forms an inverted image, the eye does not.

B. The camera always forms a real image, the eye does not.

C. The camera utilizes a fixed focal length lens, the eye does not.

D. For the camera, the image magnification is greater than one, but for the eye the magnification is less than one.

E. A camera cannot focus on objects at infinity but the eye can.

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8#

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The principal refraction of light by the eye occurs a3s)hxua- fm:zyjv * 7it the (1.0 分)

A. cornea.

B. lens.

C. retina.

D. iris.

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9#

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The closest distance at which an eye/2vjg pi n q.av.e66*dqdr ot3 can see objects clearly is (1.0 分)

A. the near point.

B. the far point.

C. nearsightedness.

D. farsightedness.

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10#

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The farthest distance at which an eye can see objectg; r e/:cd.22bn7udosefms 3b s clearly is (1.0 分)

A. the near point.

B. the far point.

C. nearsightedness.

D. farsightedness.

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11#

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If a person's eyeball is too long from front to bc 7zuk-p.bi 5tack, the person is likely to suff-bzcpki u57 .ter from (1.0 分)

A. spherical aberration.

B. nearsightedness.

C. farsightedness.

D. astigmatism.

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12#

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Nearsightedness can usually be cua-9 4q1u7bf e3et1yl*sme/tzbnv0 j orrected with (1.0 分)

A. converging lenses.

B. diverging lenses.

C. achromatic lenses.

D. cylindrical lenses.

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13#

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If the human eyeball is too long from front to back, this gives risqifg 78otav9j dp)p:5q vvz )i/h a,/he to a vision defect that can be corrected by us/d7zv8o)a9vqq,i: t ahf/pi ) 5hp jgving (1.0 分)

A. convex meniscus eyeglasses.

B. concave meniscus eyeglasses.

C. cylindrical eyeglasses.

D. contact lenses, but no ordinary lenses.

E. shaded glasses (i.e., something that will cause the iris to dilate more).

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14#

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If a person's eyeball is too short from front to back, the person io7+tmn 0wobwjw4osrplr.3/ -s likely to suffel7swnpmbt.3j+r04 wrw o/- oor from (1.0 分)

A. astigmatism.

B. spherical aberration.

C. farsightedness.

D. nearsightedness.

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15#

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Farsightedness can usu :gy1cn*elemc5zce :u1*xup *ally be corrected with (1.0 分)

A. cylindrical lenses.

B. achromatic lenses.

C. diverging lenses.

D. converging lenses.

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16#

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If the human eyeball is too short from front to back, this gives rise tvu o0q8-fj1 abo a vision defect that can be coqf108 vjobu a-rrected by using (1.0 分)

A. convex meniscus eyeglasses.

B. concave meniscus eyeglasses.

C. cylindrical eyeglasses.

D. contact lenses, but no ordinary lenses.

E. shaded glasses (i.e., something that will cause the iris to dilate more).

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17#

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What type of lens is a magnm2x,9tmwdgb6f jx, 0 wifying glass? (1.0 分)

A. converging

B. diverging

C. spherical

D. cylindrical

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18#

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An important reason for using a very large diameter objective in nn ba0 pcw,;y5xhqb4qdrg/z /ay)//kan astronomical telescope ir5bpw)z,a0 yah;gn/ynq //4c q bdxk/s (1.0 分)

A. to increase the magnification.

B. to increase the resolution.

C. to form a virtual image, which is easier to look at.

D. to increase the width of the field of view.

E. to increase the depth of the field of view.

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19#

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Consider the image formed by u9, 19zgbrdq da refracting telescope. Suppose an opaque screen is placed in front of the lower hal99qdrdbz 1,ug f of the objective lens. What effect will this have? (1.0 分)

A. The top half of the image will be blacked out.

B. The lower half of the image will be blacked out.

C. The entire image will be blacked out, since the entire lens is needed to form an image.

D. The image will appear as it would if the objective were not blocked, but it will be dimmer.

E. There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.

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20#

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Assuming the film used has uniforvlqab3) gf q4+6gq 4bjm sensitivity throughout the visible spectrum, in which of the fo6+g f j44)ag3qbqlqbvllowing cases would you be able to best distinguish between two closely spaced stars? (The lens referred to is the objective lens of the telescope used.) (1.0 分)

A. use a large lens and blue light

B. use a large lens and red light

C. use a small lens and blue light

D. use a small lens and red light

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21#

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A refracting telescope has a mag5 ,*,cl cvcolonification $m$. If the objective focal length is doubled and the eyepiece focal length is halved, what is the new magnification? (1.0 分)

A. $4 \; m$

B. $2 \; m$

C. $m/2$

D. $m/4$

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22#

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With what color light would you expi;wv( m.t51lplg-whkna--k.yc t 89aen e 5ihect to be able to see the greatest detail when using a microscope? hc .wk i1t ka-ev( ;-y-5lp .ng8aw5thnei9ml (1.0 分)

A. red, because of its long wavelength

B. yellow, because of its right wavelength

C. blue, because of its shorter wavelength

D. Color does not matter.

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23#

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Spherical lenses suffer o 767x4wd x m:fbqsq.5swmxg,from (1.0 分)

A. both spherical and chromatic aberration.

B. spherical aberration, but not chromatic aberration.

C. chromatic aberration, but not spherical aberration.

D. neither spherical nor chromatic aberration.

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24#

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Spherical mirrors suffe:gkc28y :vg etr from (1.0 分)

A. both spherical and chromatic aberration.

B. spherical aberration, but not chromatic aberration.

C. chromatic aberration, but not spherical aberration.

D. neither spherical nor chromatic aberration.

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25#

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The resolving power of a microscope refers to the 5yx4 wh3dj 1xghqg 92 v:pt+quability to (1.0 分)

A. distinguish objects of different colors.

B. form clear images of two points that are very close together.

C. form a very large image.

D. form a very bright image.

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26#

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If the diameter of a radar dish is doubled, what happens tohz9h3(:- :etcz g0xqs0yohm b its resolving power assuming that all other factors remain unchanged? tbm:3zy o-qhc h0zexshg0 (: 9 Its resolving power (1.0 分)

A. quadruples.

B. doubles.

C. halves.

D. is reduced to one-quarter its original value.

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27#

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A near-sighted person has a far point of 18 cm. What lenskyw( 90v3:em yyks/k e (in diopters) will allow this persoem3:yyew(/svk 0k9kyn to see distant objects clearly? (1.0 分)

A. +5.6 D

B. -5.6 D

C. +0.056 D

D. -0.056 D

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28#

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A person cannot see clearly tlxw v96 6gev)m- sao0objects more than 70.0 cm away. What power of lens should be prescribed if the glass is to be worn 1.0 ve)xost6 a-vgl6m09 w0 cm in front of the eye? (1.0 分)

A. $1.45 \; D$

B. $-1.45 \; D$

C. $0.0145 \; D$

D. $-0.0145 \; D$

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29#

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A nearsighted person wears glasses whose lebddalarv:g /93ec j-3 nses have power of -0.15 D. What is the person's c jblrva/ge33a9 d: -dfar point if the glasses are very close to the eyes? (1.0 分)

A. $1.5 \; m$

B. $3.3 \; m$

C. $6.0 \; m$

D. $6.7 \; m$

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30#

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What power lens is needed to correct for farsighted6/ q :gb)vrr1vyllu2tness where the uncorrected neary2qvlr) rtbg/lu :1v6 point is 75 cm? (1.0 分)

A. +2.7 D

B. -2.7 D

C. +5.3 D

D. -5.3 D

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31#

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The near point of a farsighted person is 100 cm. She places readin:-( dixymeu lpev0c i6fqsp(k. 0u48h g glasses close to her eyes, and with them spih p:su0846 xe kvqu lif-(ed.0 mcy(he can comfortably read a newspaper at a distance of 25 cm. What lens power is required? (1.0 分)

A. +2.5 D

B. +3.0 D

C. +3.2 D

D. -2.0 D

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32#

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A farsighted person can read a newspaper held 25 cm from his eyes, if he wemma p2.spn:nqpdt : qu :6+ilz-)iv:sars glasseui: zavsp-t2:. qn 6+sndmpqml: :i)p s of
+3.33 diopters. What is this person's near point? (1.0 分)

A. $4.2 \; cm$

B. $25 \; cm$

C. $31 \; cm$

D. $1.5 \; m$

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33#

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A magnifying lens has a focal length of 10 cm. A person has a near point ofcp lg: zum.bh72 l1-rk8jw9 lg 25 cm. What is the magnification of the lens for thatw1 jlug 78pl -:g2brckmz.9lh person when their eyes are focused at infinity? (1.0 分)

A. 1.5

B. 2.5

C. 3.5

D. 4.5

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34#

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A magnifying lens has a focal length of 10 cm. A person has a near point ogcwy-ggpdq 0ii,33+4e p7 ca of 25 cm. What is the magnification oi cgp 7,3ig3 0-y pd+ca4qwogef the lens for that person when their eyes are focused at their near point? (1.0 分)

A. 1.5

B. 2.5

C. 3.5

D. 4.5

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35#

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A magnifying glass has a focal length of 7.0 cm. What is the magnificationcx4zrj)o4aw1zd;;2v 0a hptc* ,vfs d if the image is viewed, 4jvdof1h*)cxw4a ;ratp 0z;vs2czd by a relaxed eye? (1.0 分)

A. 1.6

B. 2.6

C. 3.6

D. 4.6

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36#

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A person uses a converging lens of focal length 5.0 cm as a6e1qylx6hagh 95ag c ) magnifying glass. What is theh6) 69egy q ca5ah1gxl maximum possible magnification? (1.0 分)

A. 4.0

B. 5.0

C. 6.0

D. 7.0

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37#

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A person uses a converging lens of focal length 5.0 cm as a m/l eh2k7qzo/p agnifying glass. What k/2pqhzel7 /o is the magnification if the person's eye is relaxed? (1.0 分)

A. 4.0

B. 5.0

C. 6.0

D. 7.0

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38#

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You have available lenses of focal lengths 2.0 cm, 4.)p2u*ec+ kdew 0 cm, 8.0 cm, and 16.0 cm. If you were+pe 2ew kud*)c to use any two of these lenses to build a telescope, what is the maximum magnification you could achieve? (1.0 分)

A. 2.0

B. 4.0

C. 6.0

D. 8.0

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39#

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You have available lenses of foca 6 ojs/nondvx087g q)ul lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16 cm. If you were to use any two)6o7xj8n/ ogqd0 u vns of these lenses to build a telescope, what is the lens separation for the maximum magnification telescope? (1.0 分)

A. $10.0 \; cm$

B. $12.0 \; cm$

C. $18.0 \; cm$

D. $24.0 \; cm$

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40#

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The objective of a telescope has a focal length of z ,ln-mcfll +,200 cm and its eyepiece has a f ,fml +,lnc-lzocal length of
1.1 cm. What is the magnification of this telescope when viewing an object at infinity? (1.0 分)

A. 20

B. 0.0050

C. 200

D. none of the given answers

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41#

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A student constructs an astronomical telesc4t17c izg -dmkj -/lbjry/xy7 ope with a magnification of 10. If the telescope has a converging len --7z mrgjybjkxt/ y7c/ld41is of focal length 50 cm, what is the focal length of the eyepiece? (1.0 分)

A. $2.5 \; cm$

B. $5.0 \; cm$

C. $10 \; cm$

D. $25 \; cm$

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42#

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A student constructs an astronoq :w+ dtini6.rmical telescope with a magnification of 10. If the telescope has a converging lens of foctni.wq:6 rd+i al length 50 cm, what is the resulting length of the telescope? (1.0 分)

A. $53 \; cm$

B. $55 \; cm$

C. $60 \; cm$

D. $75 \; cm$

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43#

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A person is designing a 10X telescope. If the telek3 /am- bdd8cqscope is limited to a length of 20 cm, what is thea b-dqd8/kc3 m approximate focal length of the objective? (1.0 分)

A. $16 \; cm$

B. $17 \; cm$

C. $18 \; cm$

D. $19 \; cm$

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44#

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A microscope has an objective lens of fne uty-+aup a:+ g/xsgdy6o01ocal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sampy06eo-/a a npt1:uy+ uxg +gdsle is placed 1.5 mm from the objective. How far apart are the lenses? (1.0 分)

A. $20 \; mm$

B. $21 \; mm$

C. $23 \; mm$

D. $41 \; mm$

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45#

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A microscope has an objective lens of focal length 1.4 mm and an eyepiec0)yyuei4+r oje of focal leno+4yr u eyj0i)gth 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective. What is the overall magnification? (1.0 分)

A. 18

B. 37

C. 180

D. 370

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46#

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A compound microscope has an objective with a focal length of 3.00 mmipl onhr:/b i:d*8) ud and an eyepiece of focal length 6.00 cm. If 8*do:n: d/ irplhibu )the two lenses are separated by 40.0 cm, what is the total magnification? (1.0 分)

A. 27.8

B. 55.6

C. 278

D. 556

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47#

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A compound microscope has a 18-cm barrel and an opzszg( lj go3q2 ero 6h 0+-ioef).pmowj5 /b0bjective with a focal length of 8.0 mm. W ph25f m +o(j)bg.-/q0i3zwgoo6op0 ejszrelhat is the focal length of the eyepiece to give a total magnification of 240? (1.0 分)

A. $0.13 \; cm$

B. $1.5 \; cm$

C. $1.9 \; cm$

D. $2.3 \; cm$

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48#

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A binary star system in the consiajnm371kko 6 r9vh wo+xa*1utellation Orion has an angular separation of 10-5ra1o3 j*k9 7k xn1iu6a wo+hmv rad. If the wavelength of the light from the system is 500 nm, what is the smallest aperture (diameter) telescope that can just resolve the two stars? (1.0 分)

A. $0.50 \; cm$

B. $0.61 \; cm$

C. $5.0 \; cm$

D. $6.1 \; cm$

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49#

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A compound microscope is designed to resomg(a2nf9m0sa r r5gf 4qk, :. *rzagcklve objects which are 0.010 mm apart. If the focal length of the obcaf:kr g*0 f2r5,g.ks z 4a(m9 rgnqamjective is 4.0 cm and the wavelength of light used is 550 nm, what is the diameter of the objective? (1.0 分)

A. $0.27 \; mm$

B. $0.54 \; mm$

C. $2.7 \; mm$

D. $5.4 \; mm$

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50#

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The pupil of a person's eye changes from a xyau7l)x 6hdl2 nme2 +diameter of 3.5 mm to 1.5 mm as the illumination is+226x xdlnu)mye ahl7 increased. By what factor does the minimum angle of resolution change? (1.0 分)

A. 0.43

B. 0.65

C. 2.0

D. 2.3

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51#

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The 2.4-m reflecting Hubble Space nppfwr7 k+ylk 6lm +en;b)-9xTelescope has been placed into Earth orbit by the space shul -n lyfk9b+7r;+ pw)6 emnpkxttle. What angular resolution could this telescope achieve if the wavelength is 500 nm? (1.0 分)

A. $2.5 \times 10^{-7} \; rad$

B. $3.6 \times 10^{-7} \; rad$

C. $5.7 \times 10^{-7} \; rad$

D. $6.8 \times 10^{-7} \; rad$

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