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Meaning of focal length

Source language: EnglishDictionary language: English

focal length

noun

Definitions

  1. The 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.

Sources:https://en.wiktionary.org/wiki/focal%20length

Related words

focalizationf-numberfresnel numberlensedefocusfocometercofocusfocusser