No. 26 - 2008: IRTF to Get New Secondary Mirror
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What is Cassegrain? (with picture)
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TEST METHODS FOR SECONDARY MIRRORS OF CASSEGRAIN TELESCOPES WITH SPECIAL REFERENCE TO THE ESO 3.6 TELESCOPE
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astronomical optics, part 2: telescope & eyepiece combined
PDF) Compact two-mirror schemes for telescopes with a fast spherical primary
Optics and Telescopes
Mirror telescope: blocked sight - Astronomy Stack Exchange
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Two-mirror telescopes: Cassegrain, Gregorian and variants
Three-Mirror Telescope | Institute of Astronomy
What is A Secondary Mirror – Focusing Mirror On A Reflecting Telescope
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Cassegrain reflector - Wikipedia
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Why do reflecting telescopes have a secondary mirror? - Quora
