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Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...
The Abbe number for a material at a particular refractive index formulation is usually specified as its Abbe value. In practice, an Abbe number change from 30 to 32 will not have a practically noticeable benefit, but a change from 30 to 47 could be beneficial for users with strong prescriptions that move their eyes and look "off-axis" of the ...
Universal Numbering System. Universal numbering system. This is a dental practitioner view, so tooth number 1, the rear upper tooth on the patient's right, appears on the left of the chart. The Universal Numbering System, sometimes called the "American System", is a dental notation system commonly used in the United States. [ 1][ 2]
Chromatic aberration. Focal length of lens varies with the color of light. In optics, chromatic aberration ( CA ), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. [ 1][ 2] It is caused by dispersion: the refractive index of the lens elements ...
The following is a list of artists who have reached number one on the adult contemporary music singles chart in Billboard magazine since the chart's inception in 1961. The chart has gone by a variety of names over the years, including Easy Listening, Pop Standard, Middle-Road, and the current Adult Contemporary.
Frank Sinatra had four number ones in 1966.. In 1966, Billboard magazine published a chart ranking the top-performing songs in the United States in the easy listening market. . The chart, which in 1966 was entitled Easy Listening, has undergone various name changes and since 1996 has been published under the title Adult Contemporar
Cleveland Abbe. Cleveland Abbe (December 3, 1838 – October 28, 1916) was an American meteorologist and advocate of time zones. [1] [2] While director of the Cincinnati Observatory in Cincinnati, Ohio from 1871-1916, he developed a system of telegraphic weather reports, daily weather maps, and weather forecasts.
The song was also a crossover success, topping Billboard ' s pop music chart, the Hot 100, for four weeks. In addition to Frank Sinatra, Ed Ames also had three Easy Listening number ones in 1967, reaching the top spot with "My Cup Runneth Over", "Time, Time" and "When the Snow Is on the Roses". Nancy Sinatra, Al Martino and Herb Alpert & the ...