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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]
On 5 March 1946, the two governments formalized their secret treaty as the UKUSA Agreement, the basis for all signal intelligence cooperation between the NSA and GCHQ up to the present. [ 16 ] [ 17 ] UKUSA was extended to include Canada in 1948, followed by Norway in 1952, Denmark in 1954, West Germany in 1955, and Australia and New Zealand in ...
During the Second Indochina War, better known as the Vietnam War, a distinctive land warfare strategy and organization was used by the National Liberation Front of South Vietnam (NLF) or better known as the Viet Cong (VC) in the West, and the People's Army of Vietnam (PAVN) or North Vietnamese Army (NVA) to defeat their American and South Vietnamese Army of the Republic of Vietnam (ARVN ...
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Fixation disparity. Fixation disparity is a tendency of the eyes to drift in the direction of the heterophoria. While the heterophoria refers to a fusion-free vergence state, the fixation disparity refers to a small misalignment of the visual axes when both eyes are open in an observer with normal fusion and binocular vision. [1]
Murder, kidnapping, torture and intimidation were a routine part of Viet Cong (VC) and People's Army of Vietnam (PAVN) operations during the Vietnam War.They were intended to liquidate opponents such as officials, leaders, military personnel, civilians who collaborated with the South Vietnamese government, erode the morale of South Vietnamese government employees, cow the populace and boost ...
The Viet Cong [nb 1] was an epithet and umbrella term to call the communist-driven armed movement and united front organization in South Vietnam.Formally organized as and led by the National Liberation Front of South Vietnam [nb 2] and nominally conducted military operations under the name of the Liberation Army of South Vietnam (LASV), the movement fought under the direction of North Vietnam ...
Prism (optics) A familiar dispersive prism. 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 ...
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