Why does light bend, as shown in the illustration?

Question

Responses

It speeds up.
It speeds up.

It reflects light.
It reflects light.

It slows down.
It slows down.

It gains energy.
It gains energy.

Answer 1

Light bends because it slows down when it enters a medium with a different refractive index. The change in speed causes the light to change direction, resulting in bending.