An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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spherical aberration
  بیراهش ِ کُره‌ای  
birâheš-e koreyi
Fr.: aberration sphérique, ~ de sphéricité  

An aberration of a spherical lens or spherical mirror in which light rays converge not to a single point but to a series of points with different distances from the lens or mirror. Spherical aberration is corrected by using parabolic reflecting and refracting surface.

See also: → spherical; → aberration.