Here's why:

* Refraction: This bending of light is called refraction. It occurs because light travels at different speeds in different mediums.

* Speed of light: Light travels slower in glass than it does in air.

* Normal: The normal is an imaginary line perpendicular to the surface at the point where the light ray enters the glass.

* Bending: As the light ray enters the glass, it slows down. This change in speed causes the light ray to bend towards the normal.

Let me know if you'd like a diagram to illustrate this!