$A$ light of wavelength $\lambda_{1}$ and velocity $C_{1}$ travels from the first medium of refractive index $\mu_{1}$ into the second medium of refractive index $\mu_{2}$. The wavelength and velocity of light in the second medium are $\lambda_{2}$ and $C_{2}$ respectively. The refractive index of the second medium with respect to the first medium is given by:
- A$\frac{C_{2}}{C_{1}}$
- B$\frac{\mu_{2}}{\mu_{1}}$
- C$\frac{\mu_{1}}{\mu_{2}}$
- D$\frac{\lambda_{2}}{\lambda_{1}}$
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