A lens having focal lenght f and aperture size of diameter d forms an – InterviewSolution

1.	A lens having focal lenght f and aperture size of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by black paper. Focal lenght of lens and intensity of image now will be?
Answer» A lens having focal lenght f and aperture size of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by black paper. Focal lenght of lens and intensity of image now will be?

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