In a certain time, light travels 3.50 km in a vacuum. During the same time, light travels only 2.35 km in a liquid. What is the refractive index of the liquid?

1.45

Explanation:

Refractive index of the liquid is given as;

Refractive index =

But,

speed =

Since a certain light of specific wavelength was used during the same time, let the time be represented by t.

So that;

speed of light in vacuum =

speed of light in the liquid =

Refractive index = ÷

                            = x

Refractive index =

                          = 1.4536

                          = 1.45

The refractive index of the liquid is 1.45.