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.
See things that don't shine in the visible spectrum.
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.
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Radio telescopes collect radio waves. Optical telescopes capture visible light waves.