is relative refractive index can be less than 0.only answer yes or no
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It is impossible for the refractive index to be less than one, except of course, when it is less than one. The refractive index is the factor by which a wave slows down relative to the speed of light in vacuum. If refractive index is less than one, it means the wave is propagating faster than the speed of light.
So it may be a yes or no mate.
Yes, bcoz u can see the explanation below.
And no, bcoz the speed of light is very high.
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