Practice portal › Wave Optics › Polarisation

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then

Asked in NEET 2025 · Brewster's law and polarisation by reflection

• (1) Reflected light is completely polarized and the angle of reflection is close to 60°
• (2) Reflected light is partially polarized and the angle of reflection is close to 30°
• (3) Both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to 60° and 30°, respectively
• (4) Transmitted light is completely polarized with angle of refraction close to 30°

Step-by-step solution

Why the other options are wrong

• (2) Both parts are wrong: at Brewster's angle the reflected light is completely polarised, and the angle of reflection equals the angle of incidence, 60°.
• (3) The angles are right, but the transmitted light is only partially polarised.
• (4) The refraction angle is right, but it is the reflected light that is completely polarised; the transmitted light is partial.

Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.