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What happens when a light ray is incident normally (perpendicular) to the interface between two media?

Question
What happens when a light ray is incident normally (perpendicular) to the interface between two media?
It refracts sharply away from its original direction
It passes straight through without any bending
It reflects entirely back into the original medium
It is completely absorbed
Answer
It passes straight through without any bending
Detailed Explanation
A light ray incident normally (along the normal, at 0 degrees) to an interface passes straight through without bending, since sin(0) = 0 in Snell's law.
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