| http://www.w3.org/ns/prov#value | - Thin dielectric films provide constructive interference to reflect light in accordance with: Nx=2nd cos 0 (l) where: k=wavelength of the light reflected from the film; N=a positive integer if the film is mounted on a metal reflecting layer or a substrate having an index of refraction greater than the film; but N is a positive integer plus one-half, i.e. m}1/2, if the film is mounted on a substrate
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