1668, according to Alfred Rupert Hall, in his book Isaac newton: adventurer in thought.
he invented a reflecting telescope.
Isaac Newton invented his reflecting telescope in 1672.
Isaac Newton invented the reflecting telescope.
He invented the reflecting telescope in 1668 when he was 25
Newton did not invent the telescope, he invented the reflecting telescope. The reflecting telescope was a major improvement over the distorting refracting telescope.
He invented the reflecting telescope.
Even though other scientists like Galileo had the idea for a reflecting telescope, Sir Isaac Newton is credited with perfecting the reflector telescope in 1668.
Newton invented the reflecting telescope, among other items.
Isaac newton invented the reflecting telescope, and 3 laws of motion.
Isaac Newton in 1668 (courtesy of Wikipedia).
Isaac newton.
He invented the reflecting telescope. Galileo was the first to use the telescope for studies of the heavens.