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Question

If ϵ0 and μ0 represent the permittivity and permeability of vacuum and ϵ and μ represent the permittivity and permeability of medium, then refractive index of the medium is given by

A
μϵμ0ϵ0μϵ
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B
μϵμ0ϵ0
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C
μμ0ϵ0
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D
μ0ϵ0μ
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