A ray of light travelling in glass emerges into air. State whether it will bend towards the normal or away from the normal.
As glass is optically denser than air, the ray of light bends away from the normal.
Light travels more quickly through water than through glass. (a) Which is optically denser : water or glass ? (b) If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal ?