achromatic lens ( synonym found)
Definition of achromatic lens:

(n) : a lens generally composed of two separate lenses, one convex and one concave and generally of different materials, in such a way that the chromatic aberration produced by one is corrected by the other
Definition of achromatic lens:

(n) : a lens generally composed of two separate lenses, one convex and one concave and generally of different materials, in such a way that the chromatic aberration produced by one is corrected by the other
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