A thin lens focal length fi and its aperture has diameter d. It forms an image of intensity I. 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
a. f/2 and 1/2.
b. f. and 1/4
c.3f/4 and 1/2. d.f and 3I /4
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the focal length of image3f/4and 1/2
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The answer is option (c) 3f/4 and 1/2
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