A camera lens has a focal length of 180.0 mm and an aperture diameter of 16.36 mm.

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A camera lens has a focal length of 180.0 mm and an aperture diameter of 16.36 mm.
(a) What is the I-number of the lens?
(b) If the correct exposure of a certain scene is 1/30S at f/11, what is the correct exposure at f/2.8?

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College Physics

ISBN: 978-0495113690

7th Edition

Authors: Raymond A. Serway, Jerry S. Faughn, Chris Vuille, Charles A. Bennett

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Question Posted: Oct 20, 2010 12:25 AM

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A camera lens has a focal length of 180.0 mm and an aperture diameter of 16.36 mm.

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IDENTIFY The fnumber of a lens is the ratio of its focal length to it...View the full answer

College Physics

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