A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of 24 W. The radius of curvature of…

A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of $\displaystyle 24$ W . The radius of curvature of hemisphere is $\displaystyle 10$ cm and the inner surface is completely reflecting. The force on the hemisphere due to the light falling on it is $\displaystyle \_\_\_\_$× $\displaystyle 10^{-8} \mathrm{~N}$.