The Hubble Space Telescope has a number of instruments, but the primary one is an optical telescope.
There is a 3 metre radio telescope on the roof of Cardiff University. There is also an optical telescope at the site for the use of undergraduates.
"Optical", in this case, simply means that they work with light.
An optical telescope.
Neither the violin nor the Eb Sousaphone does.
Some design variants you may see in an optical telescope include telescopes that fold or divert the optical path with mirrors and telescopes that use special lenses to enhance the images.
optical
Reflector.
An optical telescope (as distinct from, say, a radio telescope). It's possible that the answer was intended to be "a refracting telescope" but reflecting telescopes use lenses as well.
See things that don't shine in the visible spectrum.
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The surface of a radio telescope doesn't have to be as flawless as the surface of an optical telescope because the radio telescope is collecting radio waves, something that will not be affected by faults in the glass. Optical telescopes, on the other hand, are collecting light, where faults in the surface can interfere with the image.