If epsilon0 and mu0 are the electric per...

If `epsilon_0` and `mu_0` are the electric permittivity and magnetic permeability in free space, `epsilon` and `mu` are the corresponding quantities in a medium,then index of refraction of the medium is

`sqrt((elispon_0mu)/(elisponmu_0))`

`sqrt(elispon/(elispon_0)`

`sqrt((elispon_0 mu_0)/(elispon mu))`

`sqrt((elispon mu)/(elipon_0mu_0)`.

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