Focal length

noun

Word Frequency: 1.8

Definitions

1.nounThe distance at which something (e.g. a lens, mirror etc.) is in focus; in air it is the distance along the optical axis from a "principal plane" of the lens to one of the lens's focal points.

Synonyms

focalization f-number fresnel number lense defocus focometer cofocus focusser f-stop fresnel focaliser f stop

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