A plane electromagnetic wave propagates in a medium moving with constant velocity \( V \ll c \) ...

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A plane electromagnetic wave propagates in a medium moving with constant velocity \( V \ll c \) relative to an inertial frame \( K \). Find the velocity of that wave in the frame \( K \) if the refractive index of the medium is equal to \( n \) and the propagation direction of the wave coincides with that of the medium.
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