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  2. Prism (optics) - Wikipedia

    en.wikipedia.org/wiki/Prism_(optics)

    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.

  3. Precision Strike Missile - Wikipedia

    en.wikipedia.org/wiki/Precision_Strike_Missile

    Maximum firing range. in excess of 310 mi (500 km) Launch. platform. M270 MLRS, M142 HIMARS. The Precision Strike Missile ( PrSM) is a short-range ballistic missile developed by the United States Army to replace the MGM-140 ATACMS . On December 8, 2023, the US Army announced that the first PrSM batch has been delivered.

  4. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    A Fresnel lens ( / ˈfreɪnɛl, - nəl / FRAY-nel, -⁠nəl; / ˈfrɛnɛl, - əl / FREN-el, -⁠əl; or / freɪˈnɛl / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.

  5. The Dark Side of the Moon - Wikipedia

    en.wikipedia.org/wiki/The_Dark_Side_of_the_Moon

    Wish You Were Here (1975) Singles from The Dark Side of the Moon. " Money "Released: 7 May 1973. " Us and Them "Released: 4 February 1974. The Dark Side of the Moon is the eighth studio album by the English rock band Pink Floyd, released on 1 March 1973 by Harvest Records in the UK and Capitol Records in the US.

  6. Porro prism - Wikipedia

    en.wikipedia.org/wiki/Porro_prism

    Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°. A double Porro system provides four ...

  7. Pavement light - Wikipedia

    en.wikipedia.org/wiki/Pavement_light

    Pavement light. Sidewalk prisms from above, with lights shining up from inside the hollow sidewalk. The purple shade has developed over a century. These are multi prisms; the ridges can be seen running vertically ( see § Transparent elements ). Pavement lights (UK), vault lights (US), floor lights, or sidewalk prisms are flat-topped walk-on ...