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An optical telescope which uses lenses is known as a refracting telescope or a Refractor one which uses a mirror is known as a reflecting telescope or a Reflector. Besides optical telescopes, astronomers also use telescopes that focus radio waves, X-rays, and other forms of electromagnetic radiation.
Product added date: 2017-03-20 12:38:57
Product modified date: 2018-04-21 14:42:46
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