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List the three main types of optical telescopes, and describe their differences.

List the three main types of optical telescopes, and describe their differences.
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List the three main types of optical telescopes, and describe their differences.

User Chevy Hungerford
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refractors, which use lenses (dioptrics)reflectors, which use mirrors (catoptrics)catadioptric telescopes, which combine lenses and mirrors.
User Jason McVetta
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