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Does any physical media exist with a refractive index less than 1? - Quora
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Negative-index metamaterial - Wikipedia
How can we design materials with negative refractive indices for perfect lensing? - Quora
Can refractive index be negative and how? - Quora
Is thickness of media effected to refraction index? - Quora
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What is negative refractive index? - Quora
Does any physical media exist with a refractive index less than 1? - Quora
What is the difference between a high and low refractive index? - Quora
Negative-index metamaterial - Wikipedia
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Can a glass refractive index be less than 1.5? - Quora
What is the difference between a high and low refractive index? - Quora