Rainbows are not usually seen as complete circles because
A) the ground is usually in the way.
B) they are actually elliptical.
C) they have no bottom part.
D) raindrops are not perfectly round.
E) rainbows are arched shaped.
Answer: A
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The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see a continuous spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
In the Northern Hemisphere, between what dates does the location of the Sun's rising and setting shift a little farther south each day?
A. from June 21 until December 21 B. from September 22 until March 20 C. from March 20 until September 22 D. from December 21 until June 21
Changing the f-number of a camera by three stops by going from f/11 to f/32 will change the intensity of the light hitting the film by a factor of
a. 8. b. 4. c. 1/4. d. 1/8. e. 32.
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