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Line 1: − + − http://www.usaarl.army.mil/hmdbook/cp_011.htm+ − +
clean up
A combination of [[lenses]] (usually in contact) which reduce [[chromatic aberration]].
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.<ref>http://www.usaarl.army.mil/hmdbook/cp_011.htm</ref>
==References==
==References==
{{reflist}}
[[category:aviation]]
[[Category:Aviation]]