Newtonian telescope
A Newtonian telescope is a type of telescope that was invented by the English scientist Sir Isaac Newton. The telescope sends an image to the back of the tube and then reflects it off an angled mirror back up the tube. The image then goes into an eyepiece and into the person's eye. The eyepiece uses one or more lenses that are used to make the image larger.
Early Newtonian telescopes were made for real science work. Now, "newtonians" are mostly used by amateur astronomers. The most popular type is the Dobsonian telescope, which is on a simple rockerbox mount. People like them because they are cheap to make and easy to use.
Newtonian Telescope Media
Woman looking through a Newtonian telescope
Newtonian telescope design
A large Newtonian with ladder to reach the eyepiece
Schmidt–Newtonian telescope.
A replica of a second reflecting telescope Newton presented to the Royal Society in 1672 (the first one he made in 1668 was loaned to an instrument maker but there is no further record of what happened to it).
References
- Smith, Warren J., Modern Optical Engineering, McGraw-Hill Inc., 1966, p. 400.
