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Unformatted text preview: Physics 1C
Quiz # 6‘ Nov. 12, 2004
Prof.]ose Onuchic MULTIPLE CHOICE Choose the one alternative that best completes thestatement or answers the question. 1) A 35 mm camera equipped with a 85 mm focal length lens is used to photograph a tree 15 m tall. The
aperture of the lens is set at f I 8.The aperture diameter at f / 8, in mm. is closest to:
A) 15 B) 9 C) 13 D) 11 E) 7 2) A 35 mm camera equipped with a 35 mm focal length lens is used to photograph a tree 15 m tall. The aperture of the lens is set at f/ 8.. A 32 mm image of the tree on the film is required. The required
distance. between the tree and the camera, to take the photograph is closest to: ' A)44m B)46m C)42m D)40m ' E)4sm . Situation 1
A lens of focal length 80 mm is used as a magniﬁer. The object being vieWed is 1.2 mm long. and is positioned at the focal
point of the lens. _ ’ 3) In Situation 1, the angle subtended by the image at infinity. in milliradians. is closest to: A) 10 B) 25 C) 5 D) 15 E) 20 4) In Situation 1, the user of the magnifier has a near point at 25 cm. The angular magnification of the
magnifier is closest to:
A) 3.1 B) 3.4 C) 4.1 D) 3.7 E) 2.8 Situation 2
A farsighted boy has a near point at 1.5 m and requires eyeglasses to correct his vision. Corrective lenses are available in '
increments in power of 0.25 diopters. The eyeglasses should have lenses of the lowest power for which the near point is
no further than 25 cm. I
' 5) In Situation '2, the correct choice of lens power for eyeglasses, in diopters, is: —
A) +3_oo B) +3.75 C) +3.50 D) +3.25 E) +4.00 6) In Situation 2, the boy borrows eyeglasses that have a power of +2.50 di0pters. With these eyeglasses. the
‘ near point of the hey. in cm. is closest to: ' A) 32 B) 41 C) 37 D) 34 E) 30. 7) A myopic girl wears eyeglasses that allow her to have clear distant vision. The power of the lenses of her
eyeglasses is —0.75 diopters. Without eyeglasses. the far point of the girl is closest to:
A) 09 m B) 1.3 m C) 1.7 m  D) 1.1 m E) 1.5 m Situation 3
The objective and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective
produces a real image 30 times the size of the object. The ﬁnal image is viewed at infinity. The near point of the
microscope user is at 25 cm . .
3) In Situation 3, the distance between the object and the focal point of the objective. in nun, is closest to:
A).0_23 B) 0.13 C) 0.33 D) 0.18 _ ‘ E) 0.23 9) In Situation 3, the overall magnification of the microscope is closest to:
A) 400 B) 450 C) 300 D) 250 E) 350 10) The eyepiece of a compound microscope has a focal length of 2.50 cm and the objective has a focal length of
1.50 cm The two lenses are separated by 20.0 cm. The microsc0pe is used by a person with normal eyes
(near point at 25 Cm). What is the angular magnification of the microscope? Hint: in this case you can not
use the lenght of the tube as the position of the image of the objective; the image should fall at the focal
point of the eypiece  please use the correct value instead of the simple approximation. A) 135 B) 175 C) 350 D) 117 E) 223 ; gag ‘ ...
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 Winter '07
 Onuich
 Waves And Optics

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