Noun
The state or quality of being achromatic; as, the achromatism of a lens; achromaticity.
Source: Webster's dictionaryHe therefore thought that the object-glasses of telescopes must for ever remain imperfect, achromatism and refraction being incompatible. Source: Internet
For example, the condition for achromatism (4) for two thin lenses in contact is fulfilled in only one part of the spectrum, since varies within the spectrum. Source: Internet
If all three constants of reproduction be achromatized, then the Gaussian image for all distances of objects is the same for the two colors, and the system is said to be in stable achromatism. Source: Internet
In uniting three colors an achromatism of a higher order is derived; there is yet a residual tertiary spectrum, but it can always be neglected. Source: Internet
Newton failed to perceive the existence of media of different dispersive powers required by achromatism; consequently he constructed large reflectors instead of refractors. Source: Internet