A point source of light is placed at the centre of curvature of a hemi – McqOptions

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1.	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 The force on the hemisphere due to the light falling on it if the source emits a power P [c is the speed of light ]
A.	\[\frac{2P}{C}\]
B.	\[\frac{P}{2C}\]
C.	\[\frac{5P}{2C}\,\]
D.	\[\frac{4P}{3C}\,\]
Answer» B. \[\frac{P}{2C}\]

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