two em waves of same (600 nm) wavelength with frequency difference of 0.1ghz. While travelling through a dispersive medium an interferometer is used to measure their wavelength difference pf 0.001 nm. What is the group velocity of the wave combination in that medium

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two em waves of same (600 nm) wavelength with frequency difference of 0.1ghz. While travelling through a dispersive medium an interferometer is used to measure their wavelength difference pf 0.001 nm. What is the group velocity of the wave combination in that medium

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