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Define refractive index of a transparent...

Define refractive index of a transparent medium ?

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Refractive index of a transparent medium is defined as the ratio of speed of light in free space (vaccum) to the speed of light in the given medium.
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Define refractive index of a tranparent medium . The speed of light in a medium of absolute refractive index 1.5 " is " 2xx10^(8)ms^(-1) . What is the speed of light in vacuum ?

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The absolute refractive index of a transparent medium is 5//3 . Find the speed of light in the medium.

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Assertion:- Different colours of light have same velocity in vaccum, but they have differnet velocites in any other transparent medium. Reason:- For different colours, refractive index of transparent medium has different values.

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