achromatism

She recognized that her style and inclinations were toward achromatism.

He attributed this achromatism to "poor lighting" and it took several weeks for the patient to fully appreciate the extent of his disability.

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

No flaming flower relieved its black achromatism although that tree had been known long ago to burst open with a three-hour glory.

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

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

Leonhard Euler in 1747 had suggested that achromatism might be obtained by the combination of glass and water lenses.

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

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.

The qualitatively divided retina (color) is thus reunited in full activity, resulting in achromatism (the absence of color).

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

Dollond was aware of the conditions necessary for the attainment of achromatism in refracting telescopes, but relied on the accuracy of experiments made by Newton.

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.

According to Schopenhauer, achromatism results when refraction occurs in one direction in the concave lens and in another direction in the convex lens.

Edward Sang, On the achromatism of the four-lens eye-piece: new arrangement of the lenses, Proceedings of the Royal Society in Edinburgh, volume 14, 1887, pp.

This word was first used by Robert Blair (d. 1828), professor of practical astronomy at Edinburgh University, to characterize a superior achromatism, and, subsequently, by many writers to denote freedom from spherical aberration.

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.

In optics, chromatic aberration (CA, also called achromatism or chromatic distortion) is a type of distortion in which there is a failure of a lens to focus all colors to the same convergence point.

For two thin lenses separated by a distance the condition for achromatism is ; if (e.g. if the lenses be made of the same glass), this reduces to , known as the condition for oculars.

James Gregory and Leonhard Euler arrived at the correct view from a false conception of the achromatism of the eye; this was determined by Chester More Hall in 1728, Klingenstierna in 1754 and by Dollond in 1757, who constructed the celebrated achromatic telescopes.