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Dictionary


fo'cal length"



Optics.
1. the distance from a focal point of a lens or mirror to the corresponding principal plane. Symbol: f
2. the distance between an object lens and its corresponding focal plane in a telescope. Also called fo'cal dis"tance.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

focalizefocal plane
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