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focal length

 - 5 dictionary results
Focus Dimensions
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Focal radius
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focal length

 
Use focal length in a Sentence
–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.
Cite This Source Link To focal length
Focus Dimensions
See Specs, Prices, Photos, Options, More on the 2010 Ford Focus.
FordVehicles.com/Focus
Focal radius
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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.
Cite This Source
Cultural Dictionary

focal length

The distance between the focal point of a lens (that is, the point at which the lens will focus parallel rays of light) and the lens itself.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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