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  2. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films or slides), and from the epidiascope , which is capable of projecting ...

  3. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    Propagation of light through a multimode optical fiber A laser beam bouncing down an acrylic rod, illustrating the total internal reflection of light in a multimode optical fiber. Optically transparent materials focus on the response of a material to incoming light waves of a range of wavelengths.

  4. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can also be used as a casting resin, in inks and coatings, and for many ...

  5. Transparency (projection) - Wikipedia

    en.wikipedia.org/wiki/Transparency_(projection)

    Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.

  6. Lowe's - Wikipedia

    en.wikipedia.org/wiki/Lowe's

    Lowe's is the exclusive retailer for both the plans and building materials for the Lowe's Katrina Cottage. They offer easy construction and affordability, as well as the possibility of expansion. Moreover, they meet all international building codes and exceed hurricane codes. Lowe's discontinued the Katrina Cottage line in 2011.

  7. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    PMMA (acrylic, plexiglas, lucite, perspex) 1.49 Window glass: ... This is light absorption in opaque materials and corresponds to an imaginary refractive index.

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