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A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of d diameter - in central

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

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