achromatic
61Achromatic lens — Ахромат (объектив, полностью исправленный на хроматическую аберрацию) …
62Achromatic sensation — Неспособность к восприятию цветов, дальтонизм …
63Achromatic sheet — Ахроматический оттиск …
64achromatic lenses — lenses that are specially designed for use in the eyepieces of microscopes and other scientific instruments. They give clear images, unblurred by the coloured fringes that are produced with ordinary lenses (caused by splitting of the light into… …
65achromatic objective — a microscope objective in which the chromatic aberration is corrected for two colors and the spherical aberration is corrected for one color …
66achromatic threshold — the least intensity of the spectrum that produces a sensation of color; reduction of intensity below this point produces a sensation of brightness only, without any color distinction …
67achromatic vision — monochromatic vision …
68achromatic lens — lens composed usually of two separate lenses used to produce images free of chromatic aberrations …
69achromatic lenses — lenses that are specially designed for use in the eyepieces of microscopes and other scientific instruments. They give clear images, unblurred by the coloured fringes that are produced with ordinary lenses (caused by splitting of the light into… …
70achromatic lens — ach′romat′ic lens′ n. opt a system of two or more lenses made of different substances so that different colors are focused at the same point, eliminating chromatic aberration • Etymology: 1860–65 …