A point source is 15 cm below a liquid-air surface. The radius of its escape circle is 20 cm. Find the refractive index of the liquid.
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Question

A point source is 15 cm below a liquid-air surface. The radius of its escape circle is 20 cm. Find the refractive index of the liquid.

G1 Physics · Accepted Answer

tan C=20/15=4/3, hence sin C=4/5 and μ=1/sinC=5/4.