Question

During refraction, waves bend when they pass from one medium to another. The waves refract because their ________ changes.

Answer 1

I believe their speed or direction changes (or both)

Answer 2

During refraction waves bend when they pass from one medium to another.

The waves gets refracted because their speed and direction changes when they travel from one medium to another.

They light bends and its velocity also changes. When the light ray passes from a more denser area to less denser area then the light ray moves away from the normal and vice versa.

Example : Water to air(Denser to rarer)