Answer: A camera lens has a focal length of 180.0 mm and
Chapter 34, Problem 34.49(choose chapter or problem)
A camera lens has a focal length of 180.0 mm and an aperture diameter of 16.36 mm. (a) What is the -number of the lens? (b) If the correct exposure of a certain scene is 1 30 s at f>11, what is the correct exposure at f>2.8?
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