A point source of light is placed at the bottom of a water lake. If the area of the illuminated circle on the surface is equal to 3 times the square of the depth of the lake . The refractive index of water is

A point source of light is placed at the bottom of a water lake. If th

1.	A point source of light is placed at the bottom of a water lake. If the area of the illuminated circle on the surface is equal to 3 times the square of the depth of the lake . The refractive index of water is
Answer» `SQRT(pi+1)` `sqrt(pi/3+1)` `pi/3+1` `pi/4+1` ANSWER :B