Question

Light propagates faster through a Medium A than through another Medium B.
(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 B
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Answer 1

Explanation:

Answer: Since light travels faster in Medium A. Medium B is optically denser than Medium A. If the ray of light passes at an angle of 90° from Medium A to Medium B there is no change in direction of propagation

Answer 2

Explanation:

Since light travels faster in Medium A. Medium B is optically denser than Medium A. If the ray of light passes at an angle of 90° from Medium A to Medium B there is no change in direction of propagation.