The dispersive power of glass is defined as the ratio (nF − nC)/(nD − 1), where C, D, and F refer to the Fraunhofer wavelengths, λc = 6563 Å, λD = 5890 Å, and λF = 4861 Å. Find the approximate group velocity in glass whose dispersive power is 1 /30 and for which nD = 1.50.
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