An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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rectilinear propagation of light
  توچش ِ راست‌خط ِ نور  
tuceš-e râst-xatt-e nur
Fr.: propagation rectiligne de la lumière  

The motion of light in the first approximation, as evidenced from the formation of shadows and other every day experience. However, → diffraction

See also: → rectilinear; → propagation; → light.