Camera Exposure: A 35-mm camera equipped with a 45-mm focal length lens is used to photograph a tree 15 m tall. If the aperture of the lens is set at f/2, what is the aperture diameter?
A. 23 mm
B. 14 mm
C. 18 mm
D. 27 mm
E. 31 mm
Answer: A
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What would you see if you were on the Moon and facing Earth when people on Earth saw a total lunar eclipse?
What will be an ideal response?
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A) 710 B) 820 C) 930 D) 1,000 E) 1,100
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