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NEET PHYSICSEasy

An unpolarised light beam strikes a glass surface at Brewster's angle. Then:

A

The refracted light will be completely polarised.

B

Both the reflected and refracted light will be completely polarised.

C

The reflected light will be completely polarised but the refracted light will be partially polarised.

D

The reflected light will be partially polarised.

Step-by-Step Solution

  1. Brewster's Law: When unpolarised light is incident on the interface of two transparent media at a specific angle known as the polarizing angle or Brewster's angle (ipi_p), the reflected light is completely plane-polarised. The vibration of the electric vector in the reflected ray is perpendicular to the plane of incidence.
  2. Refracted Ray: At this angle, the reflected and refracted rays are perpendicular to each other. However, the refracted (transmitted) ray is only partially polarised, not completely. It retains some components of vibration in the plane of incidence.
  3. Conclusion: Therefore, at Brewster's angle, the reflected light is completely polarised, while the refracted light is partially polarised.
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