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[" 34.A lens having focal length "f" and...

[" 34.A lens having focal length "f" and aperture of damele "],[" d forms an image of intensity I.Aperture of diameter "],[d/2" in central region of lens is covered by a blask "],[" paper.Focal length of lens and intensity of image "],[" now will be respectively [AlPMT (Prelims)- -2010"],[[" (1) fand "(1)/(4)," (2) "(3f)/(4)" and "(1)/(2)],[" (3) fand "(3!)/(4)," (4) "(f)/(2)" and "(1)/(2)]]

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