An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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incident ray
  پرتو ِ فتان  
partov-e fotân
Fr.: rayon incident  

The → light ray that strikes a surface before → reflection, → refraction, or → absorption. Opposite of → emergent ray.

See also: → incident; → ray.