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We know that velocity of electromagnetic wave in vacuum (v₀) = 1/√μ₀ε₀ and velocity of electromagnetic wave in medium is (v) = 1/√μ. Therefore refractive index of the medium (μ) = Vel. of E.M. wave in vacuum (v₀) / Vel. of E.M. wave in medium (v).

1. Refractive index μ = v₀/v.
2. Refractive index μ = v/v₀.
3. Refractive index μ = √v₀/v.
4. Refractive index μ = √v/v₀.

Correct answer: Refractive index μ = v₀/v.

Solution

Refractive index (μ) is defined as the ratio of the speed of light in vacuum (v₀) to the speed of light in the medium (v). Hence, μ = v₀/v.

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