An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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angle of refraction
  زاویه‌ی ِ شکست  
zâviye-yé šekast (#)
Fr.: angle de réfraction  

The angle between the direction in which a ray is refracted and the normal to the refracting surface.

See also: → angle; → refraction.