Can the absolute refractive index of a medium with respect to another medium be less than unity? Give reason.

No. Absolute refractive index less than unity indicates that speed of light in that medium is more than that in a vacuum which is impossible. The absolute refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in that medium. The speed of light in vacuum is always greater than that in any other medium.

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