An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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achromatic lens
  عدسی ِ افام، ~ بیفام  
adasi-ye afâm, ~ bifâm
Fr.: lentille achromatique  

Lens (or combination of lenses) that brings different wavelengths within a ray of light to a single focus, thus overcoming chromatic aberration.

See also: → achromatic; → lens.