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Prism (geometry) In geometry, a prism is a polyhedron comprising an n-sided polygon base, a second base which is a translated copy (rigidly moved without rotation) of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases. All cross-sections parallel to the bases are translations of the bases.
Weld-Blundell Prism. AN1923.444. The Weld-Blundell Prism ("WB", dated 1800 BCE) is a clay, cuneiform inscribed vertical prism housed in the Ashmolean Museum in Oxford. [2] The prism was found in a 1922 expedition in Larsa in modern-day Iraq by British archaeologist Herbert Weld Blundell. [3] The four sides, about 20 cm high and 9 cm wide, are ...
The Maddox rod test can be used to subjectively detect and measure a latent, manifest, horizontal or vertical strabismus for near and distance. The test is based on the principle of diplopic projection. [1] Dissociation of the deviation is brought about by presenting a red line image to one eye and a white light to the other, while prisms are ...
The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision (BSV) in the presence of increasing vergence demands. Motor fusion is largely accounted to ...
Triangular bipyramid. In geometry, a triangular prism or trigonal prism[1] is a prism with 2 triangular bases. If the edges pair with each triangle's vertex and if they are perpendicular to the base, it is a right triangular prism. A right triangular prism may be both semiregular and uniform. The triangular prism can be used in constructing ...
As a result, the vertical axis is a 2n-fold rotoreflection axis. D nh is the symmetry group for a regular n-sided prism and also for a regular n-sided bipyramid. D nd is the symmetry group for a regular n-sided antiprism, and also for a regular n-sided trapezohedron. D n is the symmetry group of a partially rotated prism.
A polarizer or polariser is an optical filter that lets light waves of a specific polarization pass through while blocking light waves of other polarizations. [1][2][3][4] It can filter a beam of light of undefined or mixed polarization into a beam of well-defined polarization, known as polarized light.
A Schmidt–Pechan prism is a type of optical prism used to rotate an image by 180°. These prisms are commonly used in binoculars as an image erecting system. The Schmidt–Pechan prism makes use of a roof prism section (from the German: "Dachkante", lit. roof edge). Binoculars designs using Schmidt–Pechan prisms can be constructed more ...