Which statement best describes what happens when light travels from air into water at an angle?

• A. It moves along straight lines in air and continues along the same lines when it enters water.
• B. It moves in a curve in air and moves in straight lines when it enters water.
• C. It moves along straight lines in air and changes direction when it enters water.
• D. It moves in a curve in air and continues moving in the same curve when it enters water.

Answer: (C)