Question

In total internal reflection, when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be the angle of refraction?

Options

• Equal to angle of incidence

• 90°

• 180°

• 0°

Answer 1

90°

Explanation:

At the critical angle, the refracted ray grazes with the surface. So, the angle of refraction is 90°.