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focal point
fo·cal point • n. the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed. ∎ the center of interest or activity: almost every sizable city can have a junior college that can act as a focal point for cultural activity. |
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"focal point." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "focal point." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O999-focalpoint.html "focal point." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-focalpoint.html |
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focal point
focal point The point at which parallel light rays from a distant object are brought together by a lens or mirror; also known as the focus. It is the location of the sharpest image of a distant object. The distance of the focal point from the lens or mirror is the focal length.
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Cite this article
"focal point." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "focal point." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O80-focalpoint.html "focal point." A Dictionary of Astronomy. 1997. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-focalpoint.html |
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