If click to zoom and represent the permittivity and permeability of vacuum and represent the permittivity and permeability of medium, then refractive index of the medium is given by
A) Square root of the ratio of permittivity and permeability of vacuum to that of the medium
B) Ratio of permittivity and permeability of the medium to that of vacuum
C) Product of permittivity and permeability of vacuum divided by the product of permittivity and permeability of the medium
D) Inverse of the square root of the product of permittivity and permeability of the medium
