Why is the refractive index always greater than 1?

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Why is the refractive index always greater than 1?

PRADEEP KUMAR 7th Dec, 2021

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PRADEEP KUMAR 7th Dec, 2021

It is because in the case of absolute Refractive Index light always travels from the vacuum (Rarer medium) to the denser medium (like water, glass etc.). So the speed of light always slows down in the denser medium and absolute refractive index is therefore always greater than 1.

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