The refractive index of water with respect to air is _aμ_w and of glass with respect to air is _aμ_g. Express the refractive index of glass with respect to water.

Fill in the blanks to complete the following sentences —

(a) When light travels from a rarer to a denser medium, its speed ……………

(b) When light travels from a denser to a rarer medium, its speed ……………

(c) The refractive index of glass with respect to air is 3/2. The refractive index of air with respect to glass will be ……………

What is the cause of refraction of light when it passes from one medium to another?

State the Snell’s laws of refraction of light.