Question

In case of refraction, what happens when a light ray is incident normally to the interface of the two media?
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Answer 1

Answer:

When ray enters the glass medium it bends towards the normal NN' that is light ray AO gets refracted on entering the glass medium. ... When a light ray is incident normally to the interface of two media then there is no bending of light ray and it goes straight through the medium.

Answer 2

if light rays is incident normally to the interface of the two media, then

it goes through rarer mediem to denser medium without changing it's path(same direction) or (straight line)

And, emergent ray would remain normal to the surface.