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What should be the distance between secondary mirror and the eyepiece in Newtonian telescope? - Quora
Optical Telescope Element - Wikipedia
The mirror of the James Webb Space Telescope: looking into the past - NASASpaceFlight.com
Kepler's Primary Mirror | NASA
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Full-size Mock-up of World's Largest Telescope Mirror Built at ESO's Open House Day | ESO Srbija
Five things to know about the James Webb Space Telescope
Telescope common aperture size comparison chart - Beginners Forum (No astrophotography) - Cloudy Nights
ESA - The largest infrared space telescope
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File:Comparison optical telescope primary mirrors.svg - Wikimedia Commons
With telescopes, size does matter | Science | In-depth reporting on science and technology | DW | 23.10.2015
