sometimes beginners come out with the most interesting questions.....
had a few people over on saturday night and we were explaining how to caculate magnifications: divide the telescope focal length by the eyepeice focal length. I was then asked why? This is a question I cannot explain. Why does the magnification depend on how many times the focal length of the eyepeice (which I understand does the actual magnification) divides into the telescope focal length?
can anyone with more knowledge of optics than I please explain?