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Instantaneous Force and Impulse

A point sourc...

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 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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Solution

As the power of source is P
As the speed of the light is c
Let the force on the hemisphere be F
Equating the power delivered,
$F c = p$
$F = \frac{P}{c}$

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