You mean astronomy, not physics. Physics is about telescopes (and other physical objects), and learning about basic telescopes, and how to improve them is part

You mean astronomy, not physics. Physics is about telescopes (and other physical objects), and learning about basic telescopes, and how to improve them is part of optics courses. Astronomy on the other hand doesn't actually care how telescopes are built (other than the data acquired by them meets the needs of the science).