When light passes from a less dense medium (like air) into a more dense medium (like water), it bends towards the normal.

Here's why:

* Speed of Light: Light travels slower in denser mediums.

* Refraction: When light enters a denser medium, one side of the light wave slows down before the other side. This causes the wave to bend, or refract.

* Normal: The normal is an imaginary line perpendicular to the surface where the light is entering.

* Direction of Bending: The bending occurs towards the normal because the side of the wave that slows down first is forced to "catch up" with the rest of the wave, resulting in a change of direction.

Let me know if you'd like a visual explanation or more details about refraction!