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PhysicsNEET 2025Diffraction and polarisation

Wave Optics

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

  1. A.The reflected light is completely polarised and the angle of reflection is close to 60°✓
  2. B.The reflected light is partially polarised and the angle of reflection is close to 30°
  3. C.Both reflected and transmitted light are perfectly polarised with angles of reflection and refraction close to 60° and 30°, respectively
  4. D.The transmitted light is completely polarised with an angle of refraction close to 30°

Solution

Brewster's angle: . The reflected beam (at ) is completely polarised; the refracted beam, at , is only partially polarised.

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