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Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex. Light will be bent towards the base and the image will be shifted towards the apex. In an eyeglass prescription, the base is typically specified as up, down, in, or out, but left and right are also ...
Minot Air Force Base ( / ˈmaɪnɒt / ⓘ MY-not; IATA: MIB, ICAO: KMIB, FAA LID: MIB) is a United States Air Force (USAF) installation in Ward County, North Dakota, thirteen miles (20 km) north of the city of Minot via U.S. Route 83. In the 2020 census, the base was counted as a CDP with a total population of 5,017, down from 5,521 in 2010. [2] Minot AFB is the home of two major wings: the ...
The Douglas fir ( Pseudotsuga menziesii) is an evergreen conifer species in the pine family, Pinaceae, which is native to western North America. The trees grow to a height of around 20 to 100 metres (70 to 330 feet) and commonly reach 2.4 metres (8 feet) in diameter. The largest coast Douglas firs regularly live for more than 500 years, with the oldest specimens more than 1,300 years old. The ...
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An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides. Not all optical prisms are geometric prisms, and not all geometric prisms ...
The Sevastopol Naval Base ( Russian: Севастопольская военно-морская база; Ukrainian: Севастопольська військово-морська база) is an occupied naval base located in Sevastopol, in the disputed Crimean Peninsula. The base is used by the Russian Navy, and it is the main base of the Black Sea Fleet. Internationally it's recognised as ...
Five nucleobases— adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U)—are called primary or canonical. They function as the fundamental units of the genetic code, with the bases A, G, C, and T being found in DNA while A, G, C, and U are found in RNA. Thymine and uracil are distinguished by merely the presence or absence of a ...
Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous ...