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Q.

When ray of light is incident on a glass slab at an angle of 60°, the reflected ray is plane polarized. The refractive index of the glass is ___

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a

0.577

b

1.732

c

1.5

d

0.866

answer is A.

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Detailed Solution

When reflected ray is completely polarized angle of incidence must Brewster angle. At Brewster angle

$μ = \tan i μ = \tan 60^{0} = \sqrt{3} = 1.732$

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