An unpolarised light beam strikes a transparent glass surface exactly at Brewster's angle. The angle

Question

An unpolarised light beam strikes a transparent glass surface exactly at Brewster's angle. The angle between the completely polarised reflected ray and the partially polarised refracted ray is

Professor PC Thomas Classes · Answer

(b) : According to Brewster's law, when unpolarised light is incident on a transparent medium at the polarizing angle (Brewster's angle), the reflected light is completely plane-polarized. Furthermore, at this specific angle of incidence, the reflected ray and the refracted ray are completely perpendicular to each other. Thus, the angle between them is strictly $90^{\circ}$.