A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12cm below the surface, the radius of this circle (in cm) is:
36√5
36√7
36√7
4√5
A
36√7
B
36√7
C
36√5
D
4√5
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Solution
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sinic=1μ=r√r2+h2 Using h=12 cm, μ=4/3 We get r=36√7 cm.
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