Значения термина achromatism на английском

He will find that he has not given exactly the proper curves to secure achromatism.

This artifice is specially adopted in objectives for astronomical photography (''pure actinic achromatism'').

Soc., 1878), the most suitable for visual instruments (''optical achromatism,').

The absence of this error is termed achromatism, and an optical system so corrected is termed achromatic.

As the diameter of the lens was so small in comparison with its focal length, its want of achromatism was inappreciable.

His encounter with achromatism also seems to have left an impression of the disabled helping each other to cope, to learn, to advance.

Newton failed to perceive the existence of media of different dispersive powers required by achromatism; consequently he constructed large reflectors instead of refractors.

For two thin lenses separated by a distance D the condition for achromatism is D = v1f1+v2f2; if v1=v2 (e.g.

Achromatic Eye-Pieces of Telescopes, and on the Achromatism of Microscopes.

(This explains the gigantic focal lengths in vogue before the discovery of achromatism.)

In uniting three colours an ''achromatism of a higher order'' is derived; there is yet a residual ''tertiary spectrum,'' but it can always be neglected.