* Refraction: When light passes from one medium to another (like from air to glass), it changes direction due to the change in the speed of light in each medium. This bending of light is called refraction.

* Speed of Light: The speed of light is fastest in a vacuum, but it slows down in other materials like glass. This is because light interacts with the atoms in the material, which delays its travel.

* Emergence: When light exits the glass and re-enters the air, it speeds back up to its original speed. This is because the interaction with the atoms decreases as it leaves the glass.

Therefore, while light slows down within the glass, it does not retain a slower speed once it exits. The light exiting the glass will have the same speed as it had when it entered the glass.