Question

A perfectly reflecting solid hemisphere of radius R is placed in the path of a parallel beam of light of large aperture. If the beam carries an intensity I, the force exerted by the hemisphere is

• A. $\frac{2\pi R^{2}l}{c}$
• B. $\frac{\pi R^{2}l}{c}$
• C. $\frac{4\pi R^{2}l}{c}$
• D. $\frac{\pi R^{2}l}{2c}$

Answer 1

The correct option is B $\frac{\pi R^{2}l}{c}$