Figure N°6-HERSCHEL Primary Reflector design-segments with or without I/F | Download Scientific Diagram
File:Primary mirror from 10-foot Herschel reflecting telescope, William Herschel, London, c. 1783 - Mathematisch-Physikalischer Salon, Dresden - DSC08152.JPG - Wikimedia Commons
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A Mirror of the Past – Herschel and the James Webb Space Telescope – Bath Royal Literary and Scientific Institution
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