Question

light propagates faster through a medium A than another medium B.
state the condition under which no change in the direction of propagation of a light ray would take place when it passes from medium A to medium B.​

Answer 1

Explanation:

1. the condition of light beam to pass through medium A to B is that the refractive indices of both medium should be same...
2. another case is that it should hit perpendicularly to the mediums....

hope it helps..