Question

it is possible to be absolute refractive less than 1 ? if not then why

Answer 1

☘️⭐Hi Mite ⭐⭐✨✨
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$$$${{{{{{{{{{. The absolute refractive index of a medium is the ratio of speed of light in vacuum to the speed of light in the medium . In this scenario , the numerator will always be greater thanthe denominator . Thus , absolute refractive index can never be less than one . }}}}}}}$$$$$$$$
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Answer 2

yes it's possible because of theory of relativity having example of plasma whatever it is rare cases