Question: A thin converging lens with aperture ratio D: f = 1: 3.5 (D is the lens diameter, f is its focal length) provides the image

A thin converging lens with aperture ratio D: f = 1: 3.5 (D is the lens diameter, f is its focal length) provides the image of a sufficiently distant object on a photographic plate. The object luminance is L = 260 cd/m 2. The losses of light in the lens amount to a =: 0.10. Find the illuminance of the image.

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