An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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extraordinary ray
  پرتو ِ استرشونیک  
partov-e ostaršunik
Fr.: rayon extraordinaire  

When a beam of → unpolarized light is incident on a → doubly refracting crystal, there will be two refracted rays. The ray for which → Snell’s law does not hold.

See also: → extraordinary; → ray.