A double convex lens of focal length 30 cm is made of glass. When it is immersed in a liquid of refractive index 1.4, the focal length is found to be 126 cm . The critical angle between glass and the liquid is

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sin−1(57)

sin−1(34)

sin−1(2123)

sin−1(12)

answer is C.

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Detailed Solution

ffλ=(μgμλ−1) (μg−1) 30126 =(μg1.4−1)0.4μg=2315μgsinC=μlsin90 sinC=μlμg=1.42315=2123

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