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  2. Deck prism - Wikipedia

    en.wikipedia.org/wiki/Deck_prism

    The deck prism laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a fire hazard. In normal usage, the prism hangs below the overhead and disperses the light sideways; the top is flat and installed flush with the deck, becoming ...

  3. Period eye - Wikipedia

    en.wikipedia.org/wiki/Period_eye

    The period eye is a concept that was devised by Michael Baxandall and described in his innovative Painting and Experience in Fifteenth-Century Italy: A Primer in the Social History of Pictorial Style, where he used it to describe the cultural conditions under which art in the Italian Renaissance was created, viewed, and understood.

  4. Wedge prism - Wikipedia

    en.wikipedia.org/wiki/Wedge_prism

    The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.

  5. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    The symmetric design, however, was difficult to accept for patients, because the eyes in general work asymmetrically. When you look to your right, your right eye views distal (i.e. looking through the lens near to the arm of the spectacles) while your left eye views nasal (i.e. looking through the lens near to the bridge). Modern sophisticated ...

  6. Google Glass - Wikipedia

    en.wikipedia.org/wiki/Google_Glass

    Prism projector, 640×360 pixels (equivalent of a 64 cm/25 in screen from 2.4 m/8 ft away) ... Google Glass, or simply Glass, is a discontinued brand of smart glasses ...

  7. Lead glass - Wikipedia

    en.wikipedia.org/wiki/Lead_glass

    Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [2]

  8. Prism (geometry) - Wikipedia

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

    A twisted prism cannot be dissected into tetrahedra without adding new vertices. The simplest twisted prism has triangle bases and is called a Schönhardt polyhedron. An n-gonal twisted prism is topologically identical to the n-gonal uniform antiprism, but has half the symmetry group: D n, [n,2] +, order 2n. It can be seen as a nonconvex ...

  9. Amici roof prism - Wikipedia

    en.wikipedia.org/wiki/Amici_roof_prism

    An Amici roof prism, named for its inventor, the Italian astronomer Giovanni Battista Amici, is a type of reflecting prism used to deviate a beam of light by 90° while simultaneously inverting the image. It is commonly used in the eyepieces of telescopes as an image erecting system. It is sometimes called an Amici prism or right angle roof ...

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