Question

What is the maximum possible value of refractive index?

Answer 1

$HERE'S THE ANSWER$
Most plastics have refractive index in the range from 1.3 to 1.7, but some high refractive index Polymers can have value as high as 1.76 for infrared light refractive indexes can be considerably higher. Germanium is transparent in the wavelength region from 2 to 14 um and has a refractive index of about 4.
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