Newtonian Telescope, 17th Century

The Newtonian telescope is a type of reflecting telescope invented by the English physicist Sir Isaac Newton (1642aEUR'1727). The earliest known functional reflecting telescope, completed in 1668, it used a concave primary mirror and a flat diagonal secondary mirror. Illustration from Louis Figuier's The Great Inventions, 1870. Color enhanced

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Astronomer Figuier Grandes Inventions Isaac Newtonian Optical Optics Reflecting Reflector Telescope

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