An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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ray of class 4
  پرتو ِ رده‌ی ِ ۳  
partw-e rade-ye 4
Fr.: rayon de classe 4  

In → rainbows, a sun ray that emerges from a water → droplet after two internal reflections. Rays of class 4 give rise to the → secondary rainbow.

See also: → ray; → class.