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 ……………

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

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

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