Question

A ray of light enters from air to a medium $X$. The speed of light in the medium is $1.5\times {10}^{8}m/s$ and the speed of light in air is $3\times {10}^{8}m/s$. Find the Refractive index of the medium $X$.

Answer 1

According to Snell's Law,

Refractive index of a medium $X=\frac{c}{v}$ where $c$ is speed of light in air and $v$ is speed of light in medium $X$.

So, Refractive Index of $X=\frac{3\times {10}^8}{1.5\times {10}^8}=2$