An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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converging mirror
  آینه‌ی ِ همگرا  
âyene-ye hamgerâ (#)
Fr.: miroir convergent  

A concave mirror that reflects a parallel beam into a convergent beam.

See also: From → converge + → -ing;
→ mirror.