Dual nature of matter

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

Give your answer in terms W W and the speed of light, c c .

W \sqrt W W 2 c \frac W{2c} 2 W c \frac {2W}c 2 W 2W

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