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There is a page named "File:Diagram Reflector ArgunovCassegrain.svg" on Wikipedia
DescriptionDiagram Reflector ArgunovCassegrain.svg English: Diagram of Argunov-Cassegrain reflector M1 = primary mirror; M2, C = corrector (2 lenses +...(886 × 531 (21 KB)) - 17:57, 10 October 2021
