achromatic point

См. также в других словарях:

• achromatic 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 …   Medical dictionary

• achromatic 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 …   From formal English to slang

• colour — /kul euhr/, n., adj. v.t., v.i. Chiefly Brit. color. Usage. See or1. * * * I Aspect of any object that may be described in terms of hue, brightness, and saturation. It is associated with the visible wavelengths of electromagnetic radiation, which …   Universalium

• tristimulus system — ▪ colour  a system for visually matching a colour under standardized conditions against the three primary colours red, green, and blue; the three results are expressed as X, Y, and Z, respectively, and are called tristimulus values.       For… …   Universalium

• Mark Moebius — (* 8. September 1973 in Summit, New Jersey, USA) ist ein deutscher Komponist. Inhaltsverzeichnis 1 Leben 2 Stipendien und Auszeichnungen 3 Werke …   Deutsch Wikipedia

• Optical aberration — v · d · e Optical aberration …   Wikipedia

• Eyepiece — For the device for looking through a camera, see viewfinder. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is… …   Wikipedia

• Chromatic aberration — On top is corner detail in a photograph taken with a higher quality lens; bottom is a similar photograph taken with a wide angle lens showing severe visible lateral chromatic aberration. The effect is pronounced on the right side of the building… …   Wikipedia

• Variations of gray — Main article: Gray shades of gray redirects here. For other uses, see shades of gray (disambiguation). There are many tints and shades of the color gray. A selection of these various colors are shown below. Gray/Grey …   Wikipedia

• microscope — /muy kreuh skohp /, n. 1. an optical instrument having a magnifying lens or a combination of lenses for inspecting objects too small to be seen or too small to be seen distinctly and in detail by the unaided eye. 2. (cap.) Astron. the… …   Universalium

• History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …   Wikipedia