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Find the solid angle subtended by a lens with a f-number (f/# = 1) at a...

Find the solid angle subtended by a lens with a f-number (f/# = 1) at a point source located at its focus.

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Answer #1

f-number of a lens is,

Where =distance=focal length(f) here

and d=diameter

Solid angle subtended by the lens is

Where = Area of lens

Solid angle subtended by the lens=  [ Answer]

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