Question

What is it called when
Light changes direction and slows down when it enters water from air.

Answer 1

When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line.

Step-by-step explanation:

Answer 2

This should be called refraction