Can the absolute value of refractive index of a medium be less than un

1.	Can the absolute value of refractive index of a medium be less than unity ?
Answer» No, this is because absolute refractive index `mu = ( c)/(v) = ("speed of light in vacuum")/("speed of light in medium")` and `v` is always less than `c`.

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Can the absolute value of refractive index of a medium be less than unity ?

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