Give three examples of materials that refract light rays. What happens to the speed of light rays when they enter these materials?

How is the refractive index of a material related to the speed of light in it?

State whether it is true or not:

When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the Refractive index of the material.

Define Snell's law of refraction. A ray of light is incident on a glass slab at an angle of incidence of 60°. If the angle of refraction be 32.7°, calculate the refractive index of glass. (Given: sin 60° = 0.866 and sin 30° = 0.5).

The speed of light in vacuum and in two different glasses is given in the table below:

(a) Calculate the absolute refractive indexes of flint glass and crown glass.

(b) Calculate the relative refractive index for light going from crown glass to flint glass.