- #1
r4nd0m
- 96
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I've been searching through the internet and some of my optics books, but nowhere was I able to find the derivation of the law for a camera lens, that the intensity of light that comes on the film or chip is proportional to [tex]\frac{D^2}{f^2}=N^2[/tex], where D is the aperture diameter, f the focal length and N the f-number. Any ideas?
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