Average force exerted on a non-reflecting surface at normal incidence is 2.4 × 10^-4 N. If 360 W / cm^2 is the light energy flux during span of 1…

Average force exerted on a non-reflecting surface at normal incidence is $\displaystyle 2.4 \times 10^{-4} \mathrm{~N}$. If $\displaystyle 360 \mathrm{~W} / \mathrm{cm}^2$ is the light energy flux during span of $\displaystyle 1$ hour $\displaystyle 30$ minutes, Then the area of the surface is: