Q.

An unpolarized light is incident on the upper surface of a glass slab at the polarising angle. Then

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a

the reflected ray is completely plane polarised with vibrations perpendicular to the plane of incidence

b

the reflected ray is partially polarised with vibrations perpendicular to the plane of incidence

c

both reflected and refracted rays are completely polarised having both of them vibrations in the plane of incidence

d

the reflected ray is also completely plane polarised with vibrations in the plane of incidence

answer is A.

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Detailed Solution

From the Brewster’s Law, the reflected ray is completely plane polarised with vibrations perpendicular to the plane of incidence.

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