The critical angle for refraction from medium −1 to air is θ1 and that from medium −2 to air is θ2 . If medium −2 is denser than medium −1 . Find the critical angle for refraction from medium −2 to medium -1.

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sin−1(sinθ2sinθ1)

sin−1(sinθ1sinθ2)

sin−1(sinθ2)

sin−1(sinθ1)

answer is A.

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Detailed Solution

sinθ1=1μ1 sinθ2=1μ2 sinθ21=(smaller valuelarger value)=μ1μ2 ∴sinθ21=sinθ2sinθ1

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