Why can no medium have a refractive index less than 1? Explain with Snell's Laws of Refraction of Light.
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2The refractive index can be less than one – John Rennie Feb 10 '23 at 09:50
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... and materials in the EUV (wavelength < ~ 10 nm) have n < 1 – garyp Feb 10 '23 at 16:47