The critical angle of a medium B with respect another medium A is 45∘ and the critical angle of a medium C with respect the medium B is 30∘. The critical angle of medium C with respect to A is :
Less than 30∘
Greater than 30∘
Cannot be determined
30∘
A
Greater than 30∘
B
Cannot be determined
C
Less than 30∘
D
30∘
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Solution
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μBsin45∘=μA
μCsin30∘=μB
μCsin30sin45=μA
μC12√2=μA
∴criticalangle=sin−1(12√2)<30∘
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