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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 18 - Refraction at Spherical Surfaces > A thin lens has focal length f, and its aperture has diameter d. It forms an image of intensity I. If the central part of the aperture, of diameter 2/d, is blocked by an opaque paper, the focal length of the lens and the intensity of image will become

A thin lens has focal length f, and its aperture has diameter d. It forms an image of intensity I. If the central part of the aperture, of diameter 2/d, is blocked by an opaque paper, the focal length of the lens and the intensity of image will become

A thin lens has focal length f and its aperture has diameter d. It forms an image of intensity I. If the central part of the aperture is blocked by an opaque paper of diameter 2/d the focal length of the lens and the intensity of image will become