Reflector telescopes (  newtonian,  gregorian, a) explain and describe the advantages and disadvantages mirror / reflector telescope types listed below, also  compare them in relative to each other. -  newtonian telescope-  gregorian and cassegrain (classic)(for the most part, there should be looked at amateur telecopes  and/or in association with when you make a telescope yourself)b)  what are the benefits and disadvantages are by having a hole in the center of the primary mirror on reflector telescopes (gregorian /   cassegrain)these questions are linked to a project where a newtonian telescope is being made.