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can the refractive index of a substance be less than 1? why/why not?

physics
 Jan 5, 2016
 #1
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I know nothing about this, but apparently, it's possible.......see  "Refractive Index Below Unity" here:

 

https://en.wikipedia.org/wiki/Refractive_index

 

 

 

cool cool cool

 Jan 5, 2016

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