An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Number of Results: 7 Search : concave
biconcave lens
  عدسی ِ دوکاو   
adasi-ye dokâv

Fr.: lentille biconcave   

Describing a lens with two concave faces.

bi-; → concave; → lens.

concave
  کاو   
kâv (#)

Fr.: concave   

Of a surface, curving inward.

From L. concavus "hollow," from → com- intensive prefix + cavus "hollow;" PIE base *keu- "a swelling, arch, cavity."

Kâv "hollow," verb kâvidan (kâftan) "to dig; to examine, investigate," cf. L. cavus "hollow" (E. derivatives: cavity, concave, cave, excavate), Gk. koilos "hollow," Armenian sor; PIE *kowos "hollow."

concave grating
  توری ِ کاو   
turi-ye kâv (#)

Fr.: réseau concave   

A → diffraction grating ruled on a concave spherical mirror that eliminates chromatic aberration and transmits regions of the spectrum, such as the ultraviolet, which is not transmitted by glass lenses.

concave; → grating.

concave lens
  عدسی ِ کاو   
adasi-ye kâv (#)

Fr.: lentille concave   

A lens which is thinner at the center than at the edges and diverges the light rays.

concave; → lens.

concave mirror
  آینه‌ی ِ کاو   
âyene-ye kâv (#)

Fr.: miroir concave   

A mirror whose surface is curved inward and converges the light rays.

concave; → mirror.

convexo-concave lens
  عدسی ِ کوژ-کاو   
adasi-ye kuž-kâv

Fr.: lentille convexo-concave   

A diverging lens having one surface convex and the opposite surface concave.

convex; → concave; → lens.

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.

plano-; → concave; → lens.