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Question

What is the ratio of the speed of light in vacuum to that in a medium called?

This question was previously asked in
RRB NTPC 2015 CBT 1 Question Paper PDF (2-Apr-2016) (Shift 3)
The correct answer is

Refractive Index

This is a factual question on Physics and is answered from standard reference knowledge.

On the basis of the established fact in this area, the matching option is: Refractive Index.

Hence, the correct answer is Refractive Index.

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