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A lens having focal length f and aperture of diameter d forms an image of...

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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

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