Newtonian telescope
Type of reflecting telescope / From Wikipedia, the free encyclopedia
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"Newton telescope" redirects here. For the observatory at the Canary Islands, see Isaac Newton Telescope.
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]