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Question

The angle of incidence at which, reflected ray is totally polarised for reflection from air to glass (refractive index =n) is:

A
sin1n
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B
sin11n
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C
tan11n
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D
tan1n
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Solution

The correct option is D tan1n
The condition for this to work is that the refelected ray and refracted ray should perpendicular to each other i.e.,θt=90θi

ηairsinθi=ηglasssinθt
sinθi=ηglasscosθi

ηglass=tanθi
θi=tan1ηglass=tan1n

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