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Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
The Vietnamese Wikipedia ( Vietnamese: Wikipedia tiếng Việt) is the Vietnamese-language edition of Wikipedia, a free, publicly editable, online encyclopedia supported by the Wikimedia Foundation. Like the rest of Wikipedia, its content is created and accessed using the MediaWiki wiki software.
Vietnam Television Station ( THVN) was established in 1965; its first broadcast was on February 7, 1966, at 6:58 pm, and the last one was at 11:58 pm on April 29, 1975. The first broadcast recorded images of Prime Minister Nguyễn Cao Kỳ and US ambassador Cabot Lodge. [9] Initially lasting for an hour, [10] the duration was later increased ...
Nam tiến. Nam tiến ( Vietnamese: [nam tǐən]; chữ Hán: 南進; lit. "southward advance" or "march to the south") is a historiographical concept [a] [2] that describes the historic southward expansion of the territory of Vietnamese dynasties ' dominions of Đại Việt from the 11th to the 19th centuries. [3] [4] [5] The concept of Nam ...
Prism (optics) 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.
Tày people. Flag of Thô Autonomous Territory, used since 1947 to 1954. The Tày people, also known as the Thổ, T'o, Tai Tho, Ngan, Phen, Thu Lao, or Pa Di, are a Central Tai -speaking ethnic group who live in northern Vietnam. According to a 2009 census, there are 1.7 million Tày people living in Vietnam. This makes them the second largest ...
Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflected by objects in the environment.
In with-the-rule astigmatism, the eye has too much "plus" cylinder in the horizontal axis relative to the vertical axis (i.e., the eye is too "steep" along the vertical meridian relative to the horizontal meridian). Vertical beams of light focus in front to horizontal beams of light, in the eye.