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When the angle of incidence results in reflected light rays being perpendicular to refracted rays, the reflected light becomes polarised with its electric field perpendicular to the plane of incidence.

1. Reflected light is completely plane polarised.
2. Refracted light is partially polarised.
3. Reflected light remains unpolarised.
4. Refracted light remains unpolarised.

Correct answer: Reflected light is completely plane polarised.

Solution

When reflected and refracted rays are perpendicular, the reflected light becomes plane polarised with its electric field vector perpendicular to the plane of incidence, as per Brewster's law.

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