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a thin lens of focal length f and is aperature has a dauaneter d.it a image of intensity I.now the outer part extending from R/2 to R is blackend.the focal length of the lens and intensity of image becomes? R=radius of aperture=d/ |
| Answer» a thin lens of focal length f and is aperature has a dauaneter d.it a image of intensity I.now the outer part extending from R/2 to R is blackend.the focal length of the lens and intensity of image becomes? R=radius of aperture=d/ | |