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focal length

World Encyclopedia | 2005 | 217 words | Copyright

focal length Distance from the midpoint of a curved mirror or the centre of a thin lens to the focal point of the system. For converging systems, it is given a positive value; for diverging systems, a negative value.

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"focal length." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

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