focal length - WordReference.com Dictionary of English

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  - fo.
  - fo'c's'le
  - FOAF
  - foal
  - foam
  - fob
  - fob watch
  - focaccia
  - focal
  - focal length
  - focal plane
  - focal point
  - focus
  - focus group
  - focus puller
  - fodder
  - foe
  - FoE
  - foehn
  - foetid
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focal length

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Concise Oxford English Dictionary © 2008 Oxford University Press:
focal length

▶noun the distance between the centre of a lens or curved mirror and its focus.

■ the equivalent distance in a compound lens or telescope.

'focal length' also found in these Oxford entries:

bifocal - dioptre - f - f-number - teleconverter - telephoto lens - wide-angle - zoom lens

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