A lens having focal length f and aperture of diameter d
forms an image of intensity I. Aperture of diameter d/2 in
central region of lens is covered by a black paper. Focal
length of lens and intensity of image now will be
respectively
(a) f and I/4
(b)3f/4 and I/2
(c) f and 3I/4
(d)f/2 and I/2
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Answer:
c)f and 3l/4
Explanation:
pls follow tannuranna 59 in my following
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