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F-number (disambiguation)

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F-number or F number may refer to: س

  • f-number, the ratio of the lens's focal length to the diameter of the entrance pupil
  • F number (chemistry), is a number that can be calculated for polycyclic aromatic hydrocarbons from their structure
  • Fujita scale, a rating of a tornado's intensity by its impact on structures and vegetation

See also

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