The velocity of light in glass whose refractive index w.r.t, air is ` 1.5 ` is ` 2 xx 10^(8) m//s `. In a certain liquid, the velocity of light is found to be ` 2.5 xx 10^(8) m//s `. The refractive index of the liquid w.r.t. air is

Options

A. `0.8`
B. `0.9`
C. `1.2`
D. `1.33`

Answer

C

Explanation

`c=1.5 xx 2 xx 10^8 =3 xx 10^(8) m//s `
`:. n_L=(V_(a))/(V_L)=(3 xx 10^(8))/( 2.5 xx 10^(8))=1.2 `