F-number (disambiguation)
From Infogalactic: the planetary knowledge core
F-number or F number may refer to:
- 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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