These can be made up to about 10 meters which is about 400 inches. Now, these telescopes only deal with visible light. There is, Ultraviolet, Infrared, Radio waves, X-Rays, Gamma Rays and Charles Ray. Today, astronomers have instruments that can sense all of these forms of non-ionizing magnetic radiation. One problem astronomers have is our atmosphere.
Water vapor bends the light.
The ionisphere filters out some wave lengths. In general, our atmosphere makes telescope work difficult. That is why most descent telescopes are way up on a mountain top. Ok, so that's what the show was about. Now, this is what you should know for the test.