Question

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....................

Answer 1

(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 $\frac{3}{2}$. The refractive index of air with respect to glass will be $\frac{2}{3}$.