A lens having focal length f and aperture of diameter d forms an image of intensity {\I}. Aperture of diameter \frac{ {\d}}{2} in central region of lens is covered by a block paper. Focal length of lens and intensity of image now will be respectively

\frac{3 {\f}}{4} and \frac{1}{2}

AIPMT 2010 Physics and Chemistry Paper

Question : 35 of 100

Marks: +1, -0

A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter ‌

in central region of lens is covered by a block paper. Focal length of lens and intensity of image now will be respectively

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