Words starting with f-n-o-r
Maybe these words will be useful:
- f-number — a number corresponding to the ratio of the focal length to the diameter of a lens system, especially a camera lens. In f /1.4, 1.4 is the f-number and signifies that the focal length of the lens is 1.4 times as great as the diameter. /, f/, f, f: Abbreviation: f.