Partial dispersion of glasses. Part 3.
The formula describing the dependence of the refractive index of glasses on lambda by means of the delta function defined in an earlier paper is transformed to a system based on the values n(2) - n(1) and n(m), meaning the main dispersion and the refractive index for a medium wavelength, respectively. The delta function becomes zero throughout for normal glasses. It is shown under what conditions the established delta function can be simplified to a linear function of the wavelength or even to a single suitable value delta(0). The accuracy of the diverse formulas is discussed by examples.
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