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If ε₀ and μ₀ are the electric permittivity and magnetic permeability in vacuum, ε and μ are corresponding quantities in medium, then refractive index of the medium is:

1. ε/ε₀
2. ε₀μ/εμ₀
3. ε₀μ₀/εμ
4. εμ/ε₀μ₀

Correct answer: εμ/ε₀μ₀

Solution

The refractive index of a medium is given by the square root of the ratio of the product of permittivity and permeability in the medium to that in vacuum, i.e., n = √(εμ / ε₀μ₀).

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