Under what condition, the angle of refraction will be equal to the angle of incidence

Solution:
The condition the angle of refraction will be equal to the angle of incidence:​​

1. If the refractive index of both the media is same.

2. If the incident ray falls normally to the surface of the second medium than the incident angle is equal to the refracted angle. In this, there is no refraction of light as there is no change in the direction of the light.