| http://www.w3.org/ns/prov#value | - eived at a light-receiving surface thereof and having a wavelength in a selected pass band of wavelengths, where a distance of separation h(x) of the two surfaces increases monotonically with displacement of a position coordinate x in the selected direction, and for at least one position the distance of separation is approximately equal to m??c /2n, where m is a positive integer and n is the real
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