An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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ordinary ray
  پرتوِ شونیک  
partov-e šunik
Fr.: rayon ordinaire  

The ray that has an → isotropic speed in a → doubly refracting crystal. It obeys → Snell’s law upon refraction at the crystal surface.
See also → extraordinary ray

See also: → ordinary; → ray.