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A spherical concave mirror has aperture ...

A spherical concave mirror has aperture diameter d and radius of curvature R. A point source of light is placed at its centre of curvature. Source emits power W and the mirror surface is completely reflecting. Find force on the mirror due to light incident on it.

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The correct Answer is:
`(Wd^(2))/(8R^(2)c)`
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