This radiation can be thought of as electric and magnetic fields traveling together in space perpendicular to each other. Newtonian telescope uses flat mirror to reflect light from curved mirror into the eyepiece. Cassegrain focus telescope uses curved secondary mirror to reflect light through a hole in the objective to a focus where the eyepiece or instrument is placed.
Magnification is the focal length of objective divided by focal length of eyepiece.
The objective is the main light collecting element of the optical telescope, either a lens or a mirror. Resolving power is the ability of a telescope to separate close objects. The resolving power of the 94-inch Hubble Space Telescope is 0.04 seconds of arc. McDonald Observatory also has 2.7 meter and 2.1 meter telescopes, and is the home of the Hobby-Eberly 9.2 meter telescope. It is made with 91 individual one-meter mirrors, and does not track across the sky like the other telescopes there.