Let $\mu_{1}$ and $\mu_{2}$ be the refractive indices of two media. $v_{1}$ and $v_{2}$ are the velocities of light in the media respectively. Which one of the following relations is $TRUE$?
- A$\mu_{1} v_{1}=\mu_{2} v_{2}$
- B$\mu_{2} v_{1}=\mu_{1} v_{2}$
- C$\mu_{1} v_{1}^{2}=\mu_{2} v_{2}^{2}$
- D$\mu_{2}^{2} v_{1}=\mu_{1}^{2} v_{2}$
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