A ray incident from a material of refractive index, n=43 to that of n=32. Find θ so that reflected light is completely polarised.
A
tan−1(32)
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B
tan−1(98)
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C
tan−1(43)
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D
tan−1(83)
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Solution
The correct option is Btan−1(98) Completely polarised light is possible when reflected light is ⊥ to refracted light. By Snell's law, 43sinθ=32sin(90−θ) tanθ=98