Question

if you have angle of incidence was 10.20 degree ;find the refractive indix

Answer 1

Explanation:

Let the refractive index of the medium be n and speed of light in air is  c.

Using Snell's law of refraction :       nair×sini=nmedium×sinr                          where  nair=1

∴   1×sini=n×sinr           ⟹n=sinrsini

Velocity of light in a medium        v=nc=sinic×sinr                          ⟹v∝sin r

Thus velocity of light is minimum in medium A.