Answer:
Velocity of light in vacuum \[=c=\frac{1}{\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}}\] Velocity of light in medium \[=\upsilon =\frac{1}{\sqrt{\mu \varepsilon }}\] \[\therefore \]Refractive index of the medium, \[\mu =\frac{c}{\upsilon }=\sqrt{\frac{\mu \varepsilon }{{{\mu }_{0}}{{\varepsilon }_{0}}}}\]
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