Why is the refractive index μ of an ordinary transparent medium greater than 1?

Question

Why is the refractive index μ of an ordinary transparent medium greater than 1? — Exam MCQ

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A. Speed of light in vacuum exceeds its speed in the medium — Since μ = c/v, the index exceeds 1 when light travels more slowly in the medium than in vacuum.

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B. The wavelength changes from a denser to a rarer medium

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C. Speed of light in vacuum equals its speed in the medium

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D. Speed of light in vacuum is less than its speed in the medium

Why is the refractive index μ of an ordinary transparent medium greater than 1?

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