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Topic: Polarization, Brewster's law, Polaroids· Optics

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

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

2. the reflected light will be partially polarised.

3. the refracted light will be completely polarised.

4. both the reflected and refracted light will be completely polarised.

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Answer: 1. the reflected light will be completely polarised but the refracted light will be partially polarised.

Key idea: At Brewster's angle the reflected ray is perpendicular to the refracted ray, and the reflected light has only the component vibrating parallel to the surface.

So the reflected light is completely (plane) polarised. The refracted light contains the whole of the other component and part of the first, so it is only partially polarised.

Hence option 1 is right. Options 3 and 4 wrongly call the refracted light completely polarised; option 2 says the reflected light is only partially polarised.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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