principal focus
Origin of principal focus
1Words Nearby principal focus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use principal focus in a sentence
The distance from the principal focus to the center of the lens is the focal length or principal focal distance of the lens.
Physics | Willis Eugene TowerThe point midway between the vertex V and center of curvature C is called the principal focus, F.
Physics | Willis Eugene TowerThe principal focus of a concave mirror may be observed by holding the mirror in a beam of sunlight entering a darkened room.
Physics | Willis Eugene TowerThe greater the refractive power of the lens, the greater the bending, and the nearer the principal focus to the lens.
General Science | Bertha M. ClarkIf the light be placed beyond the principal focus of the lens, the rays will converge to a point some distance ahead of it.
Motion Picture Operation, Stage Electrics and Illusions | Henry C. Horstmann
British Dictionary definitions for principal focus
another name for focal point
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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