The main function of a telescope is to magnify a stars image. None of the above. Refraction is the bending of light when it passes from one medium to another. Mirrors experience chromatic aberration. Reflection is the bouncing of light off a surface.
Spherical mirrors experience spherical aberration.
The two basic types of optical telescopes are Galilean telescopes and Newtonian telescopes. Cassegrain telescopes and Copernican telescopes. None of the above, there is only one type of telescope. A Newtonian telescope is easily identified by the eyepiece coming straight out the back of the telescope. None of the above.