Question

_________ of a medium is the ratio of speed of light in vacuum to the speed of light in the medium.​

Answer 1

Answer:

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Step-by-step explanation:

the index of refrection ,n, is the ratio of the speed of light in vacuum ,c, to speed of light in medium ,c, one consequence of of this difference in speed is that when light goes from one medium to another at an angle ,the propagation vector in the new medium has a different angles with respect to the normal.