The Newtonian telescope, also called the Newtonian reflector or just a Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton, using a concave primary mirror and a flat diagonal secondary mirror. Newton's first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope.[1] The Newtonian telescope's simple design has made it very popular with amateur telescope makers.[2]
- ^ Hall, A. Rupert (1992). Isaac Newton: Adventurer in Thought. Cambridge University Press. p. 67. ISBN 9780521566698.
- ^ Ingalls, Albert G., ed. (1935). Amateur Telescope Making (4th ed.). Munn and Co., Inc. [1]