Geometrical OpticsHard
Question
A fish looking up through the water can see the whole outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle in cm is
Options
A.36√7
B.36/√7
C.36√5
D.4√5
Solution
Fish must be seeing at critical angle (TIR)
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