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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 ...
The Medicare for All Act (abbreviated M4A ), also known as the Expanded and Improved Medicare for All Act or United States National Health Care Act, is a bill first introduced in the United States House of Representatives by Representative John Conyers (D-MI) in 2003, with 38 co-sponsors. [ 1][ 2] In 2019, the original 16-year-old proposal was ...
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 ...
Medicare will provide coverage when you need that second opinion. You’ll be covered as long as the second opinion is about a service that Medicare covers. You’ll pay 20% of the cost when you ...
Substance abuse, especially of alcohol and prescription drugs, for adults 60 and over is a fast-growing health problem in the U.S.. According to the 2022 National Survey on Drug Use and Health ...
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 ...