The lens in the eyepiece of a telescope magnifies light by bending it. What is this bending called?

A.

absorption

B.

dispersion

C.

radiation

D.

reflection

E.

refraction

This bending of light is called "refraction". It happens when light passes from one medium into a different one where light has a different speed. In the case of the telescope eyepiece, or even your eyeglasses, it's when the light passes from the air into the glass.