An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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effective focal length
  درازا‌ی ِ کانونی ِ ا ُسکرمند  
derâzâ-ye kânuni-ye oskarmand
Fr.: longueur focale effective  

The focal length of an imaging system, which consists of several lenses or mirrors.

See also: → effective; → focal length.