Question

If a light ray is travelling from air to glass having refracting index $1.5$ and speed of light in air is $3\times {10}^8$ m/s. Calculate the speed of light in medium.

Answer 1

Speed of light in air, $V_1$ = $3\times {10}^8\frac{m}{s}$.

Refractive index of air, $R_1$ = $1$

Refractive index of glass is $R_2$ = $1.50$

When light enters from medium 1 to medium 2, $\frac{R2}{R1}$ = $\frac{V1}{V2}$