An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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focus
  ۱) کانون؛ ۲) کانونیدن  
1) kânun; 2) kânunidan
Fr.: 1) foyer; 2) focaliser  

  1. (n.) A point where parallel light rays from an object are gathered together by a lens or a concave mirror. It is the place where the clearest image of a distant object forms. Also called focal point. See also → focal distance.

  2. (v.) To adjust the eyepiece or objective of a telescope so that the image is clearly seen by the observer.

Etymology (EN): From L. focus “hearth, fireplace,” of unknown origin,

Etymology (PE): Kânun “hearth, fireplace.”