On the monochromatization of short wave length radiations

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Abstract
The selectivity in reflectance of a stack, made from layers of two different materials whose refractive indices approach unity and which has a definite total thickness, is discussed with special emphasis given to the search for maximum reflectance. After recalling the simple relation which applies to perfectly transparent materials, the case of only one absorbing material is considered and shown to illustrate features found in the general case of two absorbing materials.