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Three-Mirror Telescope | Institute of Astronomy
Reflecting telescope - Wikipedia
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The Newtonian telescope has flat secondary mirror and a paraboloid or spherical primary mirror | Webel IT Australia
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Two-mirror tilted component telescopes
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Cassegrain reflector - Wikipedia
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Learn About Reflecting Telescope | Chegg.com
ton Reflective Spherical Mirror D76f360mm Astronomical Telescope Primary Mirror with 20mm Secondary Mirror - Newegg.com
Observatory - Optics | NASA
