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Piedras Blancas lighthouse (circa 1930) prior to removal of upper three levels. The first-order Fresnel lens at Piedras Blancas was first illuminated on February 15, 1875. [ 7 ] The Piedras Blancas lighthouse was originally 100 feet (30 m) high to the top of the ventilator ball, but earthquakes damaged the structure over the years.
Micro Four Thirds system. The Micro Four Thirds system ( MFT or M4/3 or M43) (マイクロフォーサーズシステム, Maikuro Fō Sāzu Shisutemu) is a standard released by Olympus Imaging Corporation and Panasonic in 2008, [ 1 ] for the design and development of mirrorless interchangeable lens digital cameras, camcorders and lenses. [ 2 ]
1652706, 2410455. Website. www .escondido .org. Escondido ( Spanish for "Hidden") is a city in San Diego County, California, United States. Located in the North County region, it was incorporated in 1888, and is one of the oldest cities in San Diego County. It has a population of 151,038 as of the 2020 census.
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 ...
Low-dispersion glass ( LD glass) is a type of glass with reduced chromatic aberration, meaning the refractive index does not change as strongly with different wavelengths of light. In other words, the light passing through the glass has a smaller spread or dispersion between its constituent colors, resulting in a reduced " rainbow effect" at ...
Light being refracted by a spherical glass container full of water. Roger Bacon, 13th century. Lens for LSST, a planned sky surveying telescope. The word lens comes from lēns, the Latin name of the lentil (a seed of a lentil plant), because a double-convex lens is lentil-shaped. The lentil also gives its name to a geometric figure.
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