Physics for IGCSE & O level - Rays And Waves (Section 2 - No. 10)

In the context of waves, what does 'refraction' mean?

The bending of a wave as it passes from one medium to another.

The splitting of a wave into its component colors.

The bouncing back of a wave from a surface.

The spreading out of a wave after it passes through an opening.

Refraction is the bending of a wave as it passes from one medium to another.