A ray of light travelling in air enters obliquely into water. Does the light ray bends towards the normal or away from the normal? Why?
A ray of light travelling in air enters obliquely into water. Does the light ray bends towards the normal or away from the normal? Why?

Answer-

The light ray bends in the direction of normal. When a light ray passes through an optically rarer medium (low refractive index) and enters an optically denser medium (high refractive index), it slows down and bends towards the normal. A ray of light entering water from the air will bend towards the normal because water is optically denser than air.