An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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primary mirror
  آینه‌ی ِ نخستان  
âyene-ye noxostân
Fr.: miroir primaire  

In a → reflecting telescope, the first mirror that collects the light and focuses it to the → focal plane.

See also: → primary; → mirror.