AIPMT 2010 Solved Papers
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AIPMT 2010 Physics
Q. 31. A lens having focal length f and aperture of diameter d forms an image of
intensity I. Aperture of diameter d /2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively:
Sol: By covering aperture, focal length does not change. But intensity is reduced by
times.
Answer : (3)
Q. 32. An alpha nucleus of energy 
bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to:
Sol:
Answer : (3)