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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 ...
For a doublet consisting of two thin lenses in contact, the Abbe number of the lens materials is used to calculate the correct focal length of the lenses to ensure correction of chromatic aberration. If the focal lengths of the two lenses for light at the yellow Fraunhofer D-line (589.2 nm) are f 1 and f 2 , then best correction occurs for the ...
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 ...
Sources: Invisible Institute, City of Chicago, Census Bureau, CNN. Of 10,500 complaints filed by black people between 2011 and 2015, just 166 — or 1.6 percent — were sustained or led to discipline after an internal investigation. Overall, the authority sustained just 2.6 percent of all 29,000 complaints. Nationally, between 6 and 20 percent ...
Michael Groom’s “Between the Lights” and Leon Lozano’s “A Little Hope for Chicago” were two of the grand jury prize winners of Dances With Films: LA. The celebration, hosted at the TCL ...
June 17, 2024 at 3:25 PM. The summer is coming in hot: As Thursday's solstice approaches, a heat wave is hitting the East Coast and Midwest and expected to last through at least Friday. Almost 66 ...
June 21, 2024 at 8:12 PM. CHICAGO (AP) — Facial recognition startup Clearview AI reached a settlement Friday in an Illinois lawsuit alleging its massive photographic collection of faces violated ...
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