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  • antireflection coating A thin layer of material applied to a lens surface to reduce the amount of reflected energy. Ideally the index of refraction of that material should be equal to the square root of the product of the indices of the material on either side of the...
  • hard coating Usually a dielectric coating on glass or plastic optics; a coating that is comparable in hardness to glass itself.
  • metallic coating A thin layer of metal deposited on the surface of a substrate. The film may serve as a reflector, beamsplitter, neutral density filter or electromagnetic interference filter.
  • mirror coating One or more thin-film  layers of optical material deposited on a mirror blank/substrate in order to enhance the way that substrate reflects light.  For example of optical materials/optical coatings used in this application, see metallic...
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