| http://www.w3.org/ns/prov#value | - Each of these layers must be successively and separately laid down (by such means as evaporation or sputtering deposition in a vacuum) with great accuracy to insure that the thickness of each particular dielectric material is equal to one-quarter of the specified wavelength of visible light traveling through that particular dielectric material (i.e., having the index-of-refraction of that particul
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