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Newtonian focus
Newtonian focus A focal position for a reflecting telescope at the side of its tube, at right angles to the incoming light. Light reflected from the main mirror is diverted to the Newtonian focus by a flat diagonal mirror, or a prism, higher up inside the tube. In a standard Newtonian telescope, the focal ratio and focal length are the same for the Newtonian focus as for the prime focus.
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Cite this article
"Newtonian focus." A Dictionary of Astronomy. 1997. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. "Newtonian focus." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O80-Newtonianfocus.html "Newtonian focus." A Dictionary of Astronomy. 1997. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-Newtonianfocus.html |
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Newtonian focus
Newtonian focus see telescope . |
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Cite this article
"Newtonian focus." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. "Newtonian focus." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1E1-X-Newtfoc.html "Newtonian focus." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-Newtfoc.html |
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