A thin lens has focal length fand its aperture has diameter d It forms an image of intensity Now the central part of the

Question

A thin lens has focal length fand its aperture has diameter d It forms an image of intensity Now the central part of the aperture upto diameter d 2 is blocked by an opaque paper The focal length and image intensity will change to O f 2 1 2 f 1 4 34 112

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