Apochromat

World English Dictionary
apochromat or apochromatic lens (ˌæpəˈkrəʊmæt)
 
n
Compare achromat a lens, consisting of three or more elements of different types of glass, that is designed to bring light of three colours to the same focal point, thus reducing its chromatic aberration
 
apochromatic lens or apochromatic lens
 
n

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