A convex spherical mirror with a focal length of magnitude 25 cm has a 4.0-cm tall flower placed 100 cm in front of it. What is the height of the image of the flower?
A) 0.80 cm
B) 20 cm
C) 4.0 cm
D) 1.6 cm
E) 8.0 cm
Answer: A
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?Two mirrors are at right angles to one another. If an object is placed near the mirrors, what is the largest number of images that would be seen in the mirrors?
A. ?3 B. ?2 C. ?4 D. ?5 E. ?6
A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 30.0 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
a. 25 b. 49 c. 75 d. 143 e. 30.4
All three circuits below have R = 100 ?, C = 1.0 mF, and emf ? = (5.0 V) sin (377 t). The inductors in (B) and (C) are placed sufficiently far apart so that they do not alter one another's inductance. Such inductors add combine like resistors. Which statement regarding the angular resonance frequencies ?A, ?B, and
?C is correct?
?
?
a.
?C > ?A = ?B
b.
?C < ?A = ?B
c.
?A = ?B = ?C
d.
?B < ?A = ?C
e.
?B > ?A = ?C
Increasing the focal length in a telephoto lens by a factor of nine, while keeping the aperture size constant, will change the f-number by what factor?
a. 1/3 c. 9 b. 1/9 d. 3