The speed of light in vacuum is 3.0 × 10⁸ m/s. The refractive index of a liquid is 4/3. Find the speed of light in the liquid.

Explanation

Refractive index is n=c/v. Therefore

v=(c)/(n)
=(3×10^8)/(4/3)
=3×10^8×3/4
=2.25×10^8 m/s.
Light slows in a medium with refractive index greater than 1.