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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 ...
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 ...
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 ...
This amount changes each year but is $4,660 for covered drugs in 2023 ($5,030 in 2024). While in the coverage gap, you’ll pay a certain percentage of your prescription costs out-of-pocket until ...
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 ...
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 ...
Out-of-pocket maximum. Another major difference when comparing Original Medicare to Medicare Advantage is out-of-pocket costs. Unlike traditional Medicare, Medicare Advantage plans do have an out ...
Crown glass (optics) Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low ...
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