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The critical angle for light going from medium X into medium Y is θ

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The critical angle for light going from medium X into medium Y is θ. The speed of light in medium X is v, then speed of light in medium Y is
(a) v(1 – cos θ)  (b) v/sin θ  (c) v/cos θ  (d) v cos θ
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 speed of light in medium Y is (b) v/sin θ 

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