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 12 cm below the water surface, the radius of this circle (in cm) is
AIEEE Solved Paper-2005
A)\[36\sqrt{7}\]
B) \[\frac{36}{\sqrt{7}}\]
C) \[36\sqrt{5}\]
D) \[4\sqrt{5}\]
Correct Answer:
B
Solution :
The situation is shown in figure. By Snell's law, where,is critical angle, or