Camera Exposure: If a camera lens aperture is set to f/4, then
A. the radius of the lens aperture is ¼ the focal length.
B. the focal length of the lens is 4 mm.
C. the diameter of the lens aperture is ¼ the focal length.
D. the radius of the lens aperture is 4 times its focal length.
E. the diameter of the lens aperture is 4 times its focal length.
Answer: C
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