Reflector telescope advantages:
1. Reflector telescopes do not suffer from chromatic aberration because all wavelengths will reflect off the mirror in the same way.
2. Support for the objective mirror is all along the back side so they can be made very BIG.
3. Reflector telescopes are cheaper to make than refractors of the same size.
4. Because light is reflecting off the objective, rather than passing through it, only one side of the reflector telescope’s objective needs to be perfect.
