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The Newtonian reflector
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hviezdaren - Technológie - Ďalekohľady
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Telescopes, explained by RP Photonics Encyclopedia; operation principle, refractors, reflectors, aberrations, angular resolution, magnification, field of view, light gathering power, astronomical, terrestrial
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Newtonian Telescope – Telescope Invented by Sir Isaac Newton
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File:Newtonian telescope2.svg - Wikimedia Commons
How Does a Newtonian Telescope Work?
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vik dhillon: phy217 - equatorial mountings
telescope - Reflecting telescopes | Britannica
