Unpolarised light is incident from air on a plane surface of a… | NEET 2018

Q52NEET 2018Easy

Polarisation

Unpolarised light is incident from air on a plane surface of a material of refractive index $\mu$ . At a particular angle of incidence i, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

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Answer: (b)

Reflected and refracted rays perpendicular means $i$ is the Brewster angle: $\tan i = \mu$ , so (c) and (d) are wrong.
At this angle the reflected light is completely plane polarised.
Its electric vector vibrates perpendicular to the plane of incidence (the parallel component is not reflected).
So the answer is (b).

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Polarisation question from NEET 2018

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