Yesterday Today - The first reflecting telescope built by Sir Isaac Newton in 1668 is a landmark in the history of telescopes, as the first known successful reflecting telescope. He used a
![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 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](https://c8.alamy.com/comp/2BE0YWT/sir-isaac-newtons-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-displayed-this-telescope-to-king-charles-ii-based-on-a-design-of-1668-it-had-a-focal-length-of-15cm-and-could-magnify-30-40-times-inadequate-mirrors-meant-that-the-newtonian-reflector-was-not-as-refined-as-contemporary-refracting-telescope-until-1722-when-james-haley-ground-a-quality-parabolic-mirror-this-drawing-was-published-in-the-philosophical-transactions-of-the-royal-2BE0YWT.jpg)
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
![Rendering Illustration Ancient Rotative Reflector Telescope Designed Created Sir Isaac Stock Photo by ©JoseJavierOsunaCaballero 537330470 Rendering Illustration Ancient Rotative Reflector Telescope Designed Created Sir Isaac Stock Photo by ©JoseJavierOsunaCaballero 537330470](https://st.depositphotos.com/61865358/53733/i/1600/depositphotos_537330470-stock-photo-rendering-illustration-ancient-rotative-reflector.jpg)