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Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
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 ...
December 8, 1984. ( 1984-12-08) Captain Kangaroo is an American children's television series that aired weekday mornings on the American television network CBS for 29 years, from 1955 to 1984, making it the longest-running nationally broadcast children's television program of its day. [ 2][ 3] In 1986, the American Program Service (now American ...
AbeBooks ( / ˈeɪb.bʊks / AYB-buuks[ 1]) is an e-commerce global online marketplace with seven websites that offer books, fine art, and collectables from sellers in over 50 countries. Launched in 1996, it specialises in used, rare and out-of-print books. AbeBooks has been a subsidiary of Amazon since 2008.
Eyepiece. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample.
O Captain! My Captain! at Wikisource. " O Captain! My Captain! " is an extended metaphor poem written by Walt Whitman in 1865 about the death of U.S. president Abraham Lincoln. Well received upon publication, the poem was Whitman's first to be anthologized and the most popular during his lifetime. Together with "When Lilacs Last in the Dooryard ...
Noli Me Tángere ( Latin for "Touch Me Not") is a novel by Filipino writer and activist José Rizal and was published during the Spanish colonial period of the Philippines. It explores inequities in law and practice in terms of the treatment by the ruling government and the Spanish Catholic friars of the resident peoples in the late 19th century.
In optics, the Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects. It was formulated by Ernst Abbe in the context of microscopes. [ 1] The Abbe sine condition says that. the sine of the object-space angle should be ...