Reflector Telescopes

Reflector telescopes work by way of a concave mirror that reflects the image to a smaller mirror that you view with your eyepiece.
Reflector telescopes are usually cheaper but bulkier than refractor telescopes.
However they are very popular due to the fact that you can get a much larger scope for the same amount of money usually the only lens that will be associated with the reflector scope is the eyepiece.