An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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plano-concave lens
  عدسی ِ تخت-کاو  
adasi-ye taxt-kâv (#)
Fr.: lentille plano-concave  

A → divergent lens composed of one concave surface and one plane surface. This type of lens has a negative focal point and produces a → virtual image.

See also: → plano-; → concave; → lens.