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Can absolute refractive index of any mat...

Can absolute refractive index of any material be less than one? Why?

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No. Refractive inded of a material can not be less than one
Refractive index `m=mu=C/v=("Velocity of light in vacuum")/("Velocity of light in medium")`
`:. cgtv` (always) and hence `mu` is always greatr than one.
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