Question

a crocodile looking up through the water in a lake sees the outside world contained in a circular horizon. if the refraction index of water is 4/3 and the eye of crocodile is situated 10cm below of the surface of water. what is the area of horizontal circle?​​

Answer 1

Answer:

If the angle of incidence is greater than critical angle, then the light rays will get reflected from the interface back into the denser medium. Thus, the fish living under water will only see the outside world restricted to a circular horizon when the angle of incidence is less than the critical angle.