When light travels through the lens of a telescope, it's called refraction.

Here's why:

* Refraction is the bending of light as it passes from one medium to another (in this case, from air to glass and back to air).

* The lens in a telescope is designed to bend light rays in a specific way, focusing them to a point called the focal point. This allows us to see distant objects magnified.

Let me know if you'd like more details on how telescopes work!