They don't. They are the same.
A radio telescope detects light in the form of radio waves and a refracting telescope detects light in the visible wavelengths
refracting
It is called a refracting telescope.
Infrared the answer is a refracting telescope :p
Refracting telescope.
It gathers the light coming from an object.
Concave Mirrors
A refracting telescope is a type of telescope that has a large thin lense at the front and a smaller thicker lense at the end where the eyepiece is. Refracting telescopes use lenses unlike reflecting telescopes that use mirrors to reflect the light. This is a good image of a refracting and reflecting telescope: [See related link]
"Optical", in this case, simply means that they work with light.
Refracting Telescope.
a refracting telescope
a refracting telescope