JEE Main 2014 Physics question
A diver looking up through the water sees the outside world contained in a circular horizon. The refractive index of water is , and the diver's eyes are 15 cm below the surface of the water. Then the radius of the circle is :
Answer: (2)
Solution
Light can reach the diver's eye from outside only within the cone of the critical angle: , so $θ_c =
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