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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 who defined it.
Saiff’s scenario — including his confusion — is prevalent. And with 4.1 million Americans turning 65 this year — a record number — the decision is front and center in many households ...
The Employee Retirement Income Security Act of 1974 ( ERISA) ( Pub. L. 93–406, 88 Stat. 829, enacted September 2, 1974, codified in part at 29 U.S.C. ch. 18) is a U.S. federal tax and labor law that establishes minimum standards for pension plans in private industry. It contains rules on the federal income tax effects of transactions ...
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 ...
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 ...
Like most health insurance plans, you get more coverage when you pay more for insurance. Unfortunately, many people don't realize how hard it can be to get the help they need through an MA plan ...
What the average American retiree makes. Americans 65 years and older had a median annual income of $50,290 in 2022, according to the latest data froom United States Census Bureau. While this ...
Retirement Insurance Benefits (abbreviated RIB [1]) or old-age insurance benefits [2] are a form of social insurance payments made by the U.S. Social Security Administration paid based upon the attainment of old age (62 or older). Benefit payments are made on the 3rd of the month, or the 2nd, 3rd, or 4th Wednesday of the month, based upon the ...