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In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography.
F (named ef /ˈɛf/) is the sixth letter in the modern English alphabet and the ISO basic Latin alphabet. The origin of 'F' is the Semitic letter vâv (or waw) that represented a sound like /v/ or /w/. Graphically it originally probably depicted either a hook or a club.
Класс V (F) — раздел МКБ-10, описывающий психические расстройства. Значком † в списке ниже обозначается обязательный код основной болезни. F00. Деменция при болезни Альцгеймера (G30.-†). F00.0 Деменция при болезни Альцгеймера с ранним началом.
4. Something shaped like the letter F. 5. F A grade that indicates failing status.
Browse A to Z: F Page 1. Quickly get definitions, word origins, pronunciation and more brought to you by Dictionary.com.
Guitar Chord: F Major. - a. F. A. C. F. Report Error. - C. F. A. C. F. Report Error.
FÁBIA f Portuguese Portuguese feminine form of FABIUS.
F upper case (lower case f). The sixth letter of the basic modern Latin alphabet. (Latin script): Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Sſs Tt Uu Vv Ww Xx Yy Zz. (Variations of letter F): Ḟḟ Ƒƒ ᵮ ᶂ ꜰ Ｆｆ ﬀ ﬁ ﬃ ﬂ ﬄ. F. (chemistry) Symbol for fluorine. (metrology) Symbol for farad. (computing)...
Some people remember John F. Kennedy as a charismatic man of privilege, the hero of Camelot, coasting his way to the U.S. presidency, living the... Read full biography.