Its path widens. Its path bends. Its path becomes shorter. Its path continues in a straight line.
I gave my students this multiple choice question: What happens to the path of a light ray as it passes from air into water at an angle?

Only one answer is correct among these 4 choices:
- Its path widens.
- Its path bends.
- Its path becomes shorter.
- Its path continues in a straight line.

Could you tell me which one is correct?

Its path bends.