Question:
Why is refractive index of a medium always greater than 1
Answer:
The refractive index of a medium for a light of given wavelength is the ratio of the speed of light in vacuum to its speed in that medium.
Refractive index = speed of light in vacuum / speed of light in medium
So, as we know that the maximum speed of light, is its speed in vacuum.so, the above ratio will be always greater than 1.
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