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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 ...
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 ...
American Hospital Association v. Becerra, No. 20-1114, 596 U.S. ___ (2022) The Medicare Prescription Drug, Improvement, and Modernization Act, [ 1] also called the Medicare Modernization Act or MMA, is a federal law of the United States, enacted in 2003. [ 2] It produced the largest overhaul of Medicare in the public health program's 38-year ...
To access these savings, there’s an annual membership fee of $20 for individuals and $35 for families. Kroger: The Kroger Rx Savings Club offers select medications for $6 or less for a 1-month ...
Private insurance companies administer Medicare Advantage plans. These plans cover all medically necessary services covered by Original Medicare, with additional benefits like vision, hearing, and ...
One must bear in mind that the human eye itself has an Abbe number V d ≈ 50.2 so the expensive, high-end optical glass types mentioned above have little value for central vision; however, the wearer's view through the side of a glass lens is not comparable to central vision through the eye: Low dispersion glass definitely makes optically ...
Medicare coverage begins for most Americans at 65 who are not actively covered by an employer-provided healthcare plan. The initial enrollment period is the three months before, the month of, and ...
An optical instrument is said to be diffraction-limited if it has reached this limit of resolution performance. Other factors may affect an optical system's performance, such as lens imperfections or aberrations, but these are caused by errors in the manufacture or calculation of a lens, whereas the diffraction limit is the maximum resolution ...
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