Achromats
This is the current revision of Achromats as edited by DavidB4-bot (talk | contribs) at 22:56, July 22, 2016. This URL is a permanent link to this version of this page.
A combination of lenses which reduce chromatic aberration. Since different wavelengths respond differently to refraction a second lens can be positioned behind a primary lens to bring both ends of the visible light spectrum into focus in the same plane.[1]