focal length

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Focus Dimensions
See Specs, Prices, Photos, Options, More on the 2010 Ford Focus.

focal length

–noun 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 focal distance.

Origin:
1745–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To focal length

Focus Dimensions
See Specs, Prices, Photos, Options, More on the 2010 Ford Focus.

FordVehicles.com/Focus

focal length
n. Abbr. f
The distance from the surface of a lens or mirror to its focal point. Also called focal distance, focus.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: focal length
Pronunciation: -"le[ng](k)th
Function: noun
: the distance of a focus from the surface of a lens or concave mirror —symbolf

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

focal length n.
The distance from the surface of a lens or mirror to its focal point. Also called focal distance, focus.

Science Dictionary

focal length (fō'kəl) Pronunciation Key
The distance between the optical center of a lens or mirror to its focal point.

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