Fewpal
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How is the refractive index of a medium related to the speed of light? Obtain an expression for refractive index of a medium with respect to another in terms of speed of light in these two media?

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The refractive index of the medium nm is given by 
nm=  (Speed of light in air) / (Speed of light in medium)=c/v 
Let vbe the speed of light in medium 1 and v2 be the speed of light in medium 2. The refractive index of medium 2 with respect to medium 1 is given by the ratio of the speed of light in medium 1 and the speed of light in medium 2. This is usually represented by the symbol n21
n21 =(Speed of light in medium 1)/ (Speed of light in medium 2)=v1/v2 

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