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  2. Q-plate - Wikipedia

    en.wikipedia.org/wiki/Q-plate

    A q-plate is an optical device that can form a light beam with orbital angular momentum (OAM) from a beam with well-defined spin angular momentum (SAM). Q-plates are based on the SAM-OAM coupling that may occur in media that are both anisotropic and inhomogeneous , such as an inhomogeneous anisotropic birefringent waveplate .

  3. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    Wire reticles are the oldest type of reticles and are made out of metal wire or thread, mounted in an optically appropriate position in the telescopic sight's tube. Etched reticles are an optic element, often a glass plate, with inked patterns etched onto it, and are mounted as an integrated part of the lightpath. When backlit through the ...

  4. List of telescope parts and construction - Wikipedia

    en.wikipedia.org/wiki/List_of_telescope_parts...

    Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope. Meniscus corrector: A meniscus-shaped corrector plate usually used in the Maksutov telescope.

  5. Springfield Armory, Inc. - Wikipedia

    en.wikipedia.org/wiki/Springfield_Armory,_Inc.

    Springfield Armory, Inc., is an American commercial firearms manufacturer and importer based in Geneseo, Illinois. Founded in 1974 by Bob Reese and family, the company produces rifles such as the M1A and imports handguns such as the XD series and Hellcat .

  6. Springfield Armory XD - Wikipedia

    en.wikipedia.org/wiki/Springfield_Armory_XD

    The Springfield Armory XD is a series of semi-automatic pistols produced by Springfield Armory, Inc., along with follow-on variants: XD-M, XD-S, and XD-E. [1] Polymer -framed and predominantly striker-fired , the series is manufactured by HS Produkt in Karlovac, Croatia .

  7. Zone plate - Wikipedia

    en.wikipedia.org/wiki/Zone_plate

    Binary zone plate: The areas of each ring, both light and dark, are equal. Sinusoidal zone plate: This type has a single focal point. A zone plate is a device used to focus light or other things exhibiting wave character. [1] Unlike lenses or curved mirrors, zone plates use diffraction instead of refraction or reflection.

  8. 5 Things to Avoid When You Have Alopecia Areata - AOL

    www.aol.com/5-things-avoid-alopecia-areata...

    4. Not Enough Vitamin D. You shouldn’t get too much sun, but some vitamin D exposure is essential.A review of studies found that people with certain autoimmune diseases may have a vitamin D ...

  9. Springfield Armory - Wikipedia

    en.wikipedia.org/wiki/Springfield_Armory

    It is now the Springfield Armory National Historic Site, and is managed and operated by the National Park Service. As of 2011, the 35 acres behind the Springfield Armory (and several of its former buildings) housed Springfield Technical Community College (STCC). STCC is the only "technical" community college in Massachusetts, which aims to ...

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