* When light travels from a less dense medium (like air) to a denser medium (like water), it bends *towards* the normal. This is called refraction.
* When light travels from a denser medium to a less dense medium, it bends *away* from the normal. Again, this is refraction.
Let's clarify some terms:
* Normal: An imaginary line perpendicular to the surface of the medium where the light enters.
* Dense medium: A material where light travels slower (e.g., water, glass).
* Less dense medium: A material where light travels faster (e.g., air, vacuum).
Why does light bend?
Light bends because it changes speed as it enters a different medium. This change in speed causes the direction of the light to change. The amount of bending depends on the difference in the speed of light in the two mediums and the angle at which the light hits the surface.
