A light ray from air strikes an unknown medium at angle 60° as shown. If the angle of refraction is 30°. Evaluate the refractive index of the medium.

Q. A light ray from air strikes an unknown medium at angle 60° as shown. If the angle of refraction is 30°. Evaluate the refractive index of the medium.

Q. A light ray travels from air to an unknown transparent medium strikes at an angle of ${60}^o$, where its speed got reduced to $2\times {10}^{8}m{s}^{-1}$. If the speed of light in air is $3\times {10}^{8}m{s}^{-1}$, the calculate the angle of refraction of the light ray inside the medium.

Q. Calculate the refractive index of the medium Y, when a light ray enters from air at an angle $\angle i={45}^{\circ }$, and $\angle r={30}^{\circ }$?

Q. When a light ray moves from air to a transparent medium the angle of incidence and the angle of refraction are ${45}^{\circ }$ and ${30}^{\circ }$ respectively. Find the refractive index of this medium is