Question

Question From Physics...
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Can The Refrective Index of Any Substance be Less Than 1? Why?
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Give Proper Answer....
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Answer 1

ans = Velocity of sound can be faster than the speed of light in the vaccum and thereby it gives a reflective index less than 1 while ..
Normally refractive index can not be less than . But in case of metamaterials we can have negative refractive index.

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