A lens having focal length f and aperture of diameter d

Last updated: 5/30/2023

A lens having focal length f and aperture of diameter d forms an image of intensity I Aperture d of diameter in central region of lens is covered 2 by a black paper Focal length of lens and intensity of image now will be respectively f 1 and 1 2 2 2 fand 3 3f 4 4 and 31