Question

what is negative index??​

Answer 1

THE INDEX WHICH IS NOT POSITIVE...

LOL...

JUST JOKING...

Negative-index metamaterial or negative-index material (NIM) is a metamaterial whose refractive index for an electromagnetic wave has a negative value over some frequency range.

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Answer 2

Index (indices) in Maths is the power or exponent which is raised to a number or a variable. For example, in number 24, 4 is the index of 2

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