e/Doublet (lens)

Information
has gloss	eng: In optics, a doublet is a type of lens made up of two simple lenses attached together. The lenses are made from glasses with different refractive indices and different amounts of dispersion. Often one element is made from crown glass and the other from flint glass. This combination produces a better image than a simple lens. Trilobites, which are now extinct, had natural doublet lenses.
lexicalization	eng: Doublet lens
lexicalization	eng: doublet
instance of	(noun) a lens that focuses the image in a camera optical lens, camera lens

Meaning
French
has gloss	fra: En optique, un doublet est lassociation de deux lentilles pour former un système optique. On le caractérise généralement par la position des centres optiques des lentilles. Ce type dassociation permet de modéliser et de comprendre le fonctionnement dun très grand nombre dinstruments d'optique.
lexicalization	fra: Doublet
Polish
has gloss	pol: Dublet – rodzaj obiektywu w postaci złożonej soczewki, składającej się z dwóch szkieł (soczewek) o różnym współczynniku załamania i z różną dyspersją. Taki układ daje lepszy obraz niż pojedyncza soczewka.
lexicalization	pol: Dublet
Chinese
has gloss	zho: 雙合透鏡是將兩片單透鏡結合在一起的光學設計。這兩片透鏡分別用折射率和色散都不同的玻璃製成，通常一片是冕牌玻璃（Crown glass），另外一片是燧石玻璃（flint glass）。這樣的組合產生的影像品質比單一透鏡好，而三合透鏡，但現在已經幾乎絕跡了，自然又比雙合透鏡好。
lexicalization	zho: 雙合透鏡

Media
media:img	Achromat doublet en.svg
media:img	Doublet.gif