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  2. The Black Prism - Wikipedia

    en.wikipedia.org/wiki/The_Black_Prism

    The Black Prism is a fantasy novel by American author Brent Weeks. It is the first book in the five-volume [ 1 ] Lightbringer Series and follows Gavin Guile, known as the 'Prism' and the most powerful person in the world, [ 2 ] as he combats an uprising led by a self-proclaimed king.

  3. Prismatic World Tour - Wikipedia

    en.wikipedia.org/wiki/Prismatic_World_Tour

    The Prismatic World Tour was the third concert tour by American singer Katy Perry, in support of her fourth studio album, Prism (2013). The tour began on May 7, 2014, at Belfast, Northern Ireland's Odyssey Arena and ended on October 18, 2015, at Alajuela, Costa Rica's Parque Viva after six legs. [2]

  4. Optical spectrometer - Wikipedia

    en.wikipedia.org/wiki/Optical_spectrometer

    The light then passed through a prism (in hand-held spectroscopes, usually an Amici prism) that refracted the beam into a spectrum because different wavelengths were refracted different amounts due to dispersion. This image was then viewed through a tube with a scale that was transposed upon the spectral image, enabling its direct measurement.

  5. Dioptre - Wikipedia

    en.wikipedia.org/wiki/Dioptre

    Over the counter reading glasses are rated at +1.00 to +4.00 dioptres. Concave lenses have negative dioptric value and generally correct myopia (nearsightedness). Typical glasses for mild myopia have a power of −0.50 to −3.00 dioptres.

  6. Telescope - Wikipedia

    en.wikipedia.org/wiki/Telescope

    Hitomi telescope's X-ray focusing mirror, consisting of over two hundred concentric aluminium shells X-rays are much harder to collect and focus than electromagnetic radiation of longer wavelengths. X-ray telescopes can use X-ray optics , such as Wolter telescopes composed of ring-shaped 'glancing' mirrors made of heavy metals that are able to ...

  7. Esotropia - Wikipedia

    en.wikipedia.org/wiki/Esotropia

    Esotropia (from Greek eso 'inward' and trope 'a turning' [1]) is a form of strabismus in which one or both eyes turn inward. The condition can be constantly present, or occur intermittently, and can give the affected individual a "cross-eyed" appearance. [2]

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