An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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angle of incidence
  زاویه‌ی ِ فتاد  
zâviye-ye fotâd
Fr.: angle d'incidence  

The angle formed between a ray of light striking a surface and the normal to that surface at the point of incidence. Also called → incidence angle.

See also: → angle; → incidence.