Cassegrain reflector - Wikipedia
Basics of telescope optics and mounting
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Two-mirror telescopes: Cassegrain, Gregorian and variants
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Reflecting Telescopes
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Telescope Types
They use concave mirrors in the telescope to see very far...
Telescope Types
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Uses of Convex & Concave Mirrors
How to realize a convex secondary mirror – The Grattavetro
The Newton reflector
