Synonymer & Oplysninger om | engelsk ord ACHROMATIC

---

---

---

---

---

---

---

---

---

Eksempler på brug af ACHROMATIC i en sætning

• Abbe numbers are used in the design of achromatic lenses, as their reciprocal is proportional to dispersion (slope of refractive index versus wavelength) in the wavelength region where the human eye is most sensitive (see graph).
• In collaboration (1827–1832) with optician George Dollond, Barlow built an achromatic lens that utilized liquid carbon disulfide.
• An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration.
• According to Taylor, the lens design was derived by considering a cemented achromatic doublet consisting of one thin negative element and one thin positive element, both of equal power; such a doublet would result in a compound lens with zero net power but also a flat field of focus.
• A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet lens because of their compensating optical properties, which reduces chromatic aberration (colour defects).
• Despite common belief, the Tessar was not developed from the 1893 Cooke triplet design, although it appears the Tessar replaces the single rear element of the Cooke triplet with a cemented achromatic doublet.
• Black-and-white (B&W or B/W) images combine black and white to produce a range of achromatic brightnesses of grey.
• John Dolland presents his "Account of some experiments concerning the different refrangibility of light" (Philosophical Transactions of the Royal Society (London)) describing the discovery of a means of constructing doublet achromatic lenses by the combination of crown and flint glasses, reducing chromatic aberration.
• English optician Chester Moore Hall (1703–1771) develops an achromatic lens (or achromat) commonly used as the objective of small refracting telescopes.
• A colorimetric (or more specifically photometric) grayscale image is an image that has a defined grayscale colorspace, which maps the stored numeric sample values to the achromatic channel of a standard colorspace, which itself is based on measured properties of human vision.
• Determining the achromatic number is NP-hard; determining if it is greater than a given number is NP-complete, as shown by Yannakakis and Gavril in 1978 by transformation from the minimum maximal matching problem.
• Starting around 1826, James South made plans for a new, larger telescope, an equatorially mounted achromatic refractor (a telescope with a lens) in a new observatory.
• He made observations of Mars with an 11 cm achromatic refractor telescope made by Joseph von Fraunhofer, which was one of the first times that achromatic refractors were used for planetary observation; these were a notable improvement over the reflectors available to earlier observers.
• This telescope could only magnify 10x, however, the objective was ground according to "Dollond's principle", meaning it was achromatic.
• An achromatic eyepiece that he invented for telescopes and microscopes continues to be known as the Ramsden eyepiece.
• In 1855, optician William Malcolm of Syracuse, New York began producing his own telescopic sight, used an original design incorporating achromatic lenses such as those used in telescopes, and improved the windage and elevation adjustments.
• The observatory's 'lantern' (cupola) included a P & J Dollond Achromatic Refracting Telescope, which could identify ships 30 miles (48 km) to sea.
• Amongst the latter were a Dollond 46-inch achromatic, aperture 3¾ inches, and the one Cassegrain reflector constructed by Short, of 24 inches focus and 6 aperture, known among opticians as 'Short's Dumpy.
• As far as we can ascertain, Joseph von Fraunhofer, some time not long before 1820, constructed the first heliometer with an achromatic divided object-glass, i.
• Pure achromatic colors include black, white, all grays and beiges; near neutrals include browns, tans, pastels, and darker colors.

Sideforberedelse tog: 181,98 ms.