achromatic lens

noun

: a lens made by combining lenses of different glasses having different focal powers so that the light emerging from the lens forms an image practically free of chromatic aberration

Illustration of achromatic lens

• A light source
• B crown glass
• C flint glass
• D corrected wavelength focal point

Word History

First Known Use

1796, in the meaning defined above

Medical Definition

achromatic lens

noun

: a compound lens made by combining lenses of different glasses (as flint glass and crown glass) with different focal powers so that the light emerging from the lens forms an image almost free from unwanted colors