An observer located close to the mirror and 3 R /4 below the axis, is looking at the image of a distant point P, made by a circular mirror of radius R . If the central part of radius R /2 is removed f

Question

An observer located close to the mirror and $3 R /4$ below the axis, is looking at the image of a distant point P, made by a circular mirror of radius $R$ . If the central part of radius $R /2$ is removed from the mirror then the ratio of intensity received by the eye before and after the removal of central part will be:

TestHub · Accepted Answer

The eye at 3 R /4 below the axis receives rays only from the part of the mirror near its own position. The removed central part (radius R /2 ) does not send rays to the eye. So the number of rays received is the same before and after: ratio 1 : 1.

Physics - Geometrical Optics Question with Solution | TestHub

Options:

Doubts & Discussion