Question: A point source of light is placed at the centre of curvature of a hemispherical surface. The radius of curvature is r and the

A point source of light is placed at the centre of curvature

A point source of light is placed at the centre of curvature of a hemispherical surface. The radius of curvature is r and the inner surface is completely reflecting. Find the force on the hemisphere due to the light falling on it if the source emits a power W.

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