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Refractive index means

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Refractive Index\tThe extent of the change in direction that takes place in a given pair of media is expressed in terms of the refractive index.\tIt turns out that light propagates with different speeds in different media.\tThe value of the refractive index for a given pair of media depends upon the speed of light in the two media.
It is the ratio of speed of light in vaccum to the speed of light in that medium.It is denoted by n and ų


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