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A thin layer of material applied to a 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 coating,while the ideal thickness for a single-layer coating is one quarter of the wavelength at which reflectance is to be minimized.

         

          

       

2.ANTI-REFLECTIVE COATING

A thin layer of material applied to a 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 coating ,while the ideal thickness for a single-layer coating is one-quarter of the wavelength at which reflectance is to be minimized.