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The Royal Society on Twitter: "Reflecting telescope, designed and made by Isaac Newton. He built his first reflecting telescope in 1668; this is his second model. The telescope consists of two tubes,
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reflecting telescope | Britannica
File:NewtonsTelescopeReplica.jpg - Wikimedia Commons
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Observatory | NASA
Sir Isaac Newton's reflecting telescope, known also as the Newtonian telescope. It worked by concentrating light by reflection from a parabolic mirror, instead of by refraction through a lens. Newton (1642-1727) first
