An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Newton's equation
  هموگش ِ نیوتن  
hamugeš-e Newton
Fr.: équation de Newton  

In → geometric optics, an expression relating the → focal lengths of an → optical system (f and f’) and the object x and image x’ distances measured from the respective focal points. Thus, ff’ = xx’. Same as Newton’s formula.

See also: → Newton; → equation.