Two-mirror telescopes: Cassegrain, Gregorian and variants
In a Cassegrain telescope, which of the following mirrors is used as the secondary mirror?
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Which of the following optical instruments are used in a Cassegrain telescope?
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In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
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Schmidt–Cassegrain telescope - Wikipedia
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