An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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double refraction
  شکست ِ دوتایی  
šekast-e dotâyi
Fr.: double réfraction  

Formation of two refracted rays of light from a single incident ray; property of certain crystals, notably calcite.

See also: → double; → refraction.