Problem 5.264

A plane light wave of intensity \(I=0.20 \mathrm{~W} / \mathrm{cm}^{2}\) falls on a plane mirror surface with reflection coefficient \(\rho=0.8 .\) The angle of incidence is \(45^{\circ} .\) In terms of the corpuscular theory find the magnitude of the normal pressure exerted by light on that surface