Question

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

Answer 1

If both the media are having the same refractive index, then angle of incidence and angle of refraction are same. 

If the incident ray falls perpendicularly on the second medium, then the incident angle and refracted angle are same. 

In the above cases, actually?refraction does not take place. We say that a ray is refracted, when it deviated from its straight line path. In both of the cases, the?incident ray does not deviate?from its straight line path.

Answer 2

Answer:if the rafractive index of both the medium is the same

Explanation:

If the incident ray falls normally to the surface of the 2nd medium. Then 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