bn:03301865n
Noun Concept
Categories: Mirrors, Telescope stubs, Telescopes, Optics stubs
EN
secondary mirror  spider vane
EN
A secondary mirror is the second deflecting or focusing mirror element in a reflecting telescope. Wikipedia
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EN
A secondary mirror is the second deflecting or focusing mirror element in a reflecting telescope. Wikipedia
Second mirror element/focusing surface in a reflecting telescope Wikipedia Disambiguation
secondary deflecting or focusing mirror in a reflecting telescope Wikidata
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