Question:
A sphere of radius $1.00 \mathrm{~cm}$ is placed in the path of a parallel beam of light of large aperture. The intensity of the light is $0.5 \mathrm{~W}$ $\mathrm{cm}^{-2}$. If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere.
Solution:
