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The refractive index of a given element is 1.6. what is the meaning of the statement in relation to speed of light?

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The refractive index?of a medium is a measure of the?speed of light?in that medium. It is expressed as a ratio ofspeed of light?in vacuum relative to that in the medium under consideration.?Refractive index=n=speed of light?in vacuum/speed of light?in?givenmedium.
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refractive index means the ratio of the velocity of light in a vacuum to its velocity in a specified medium. the above statement means that the speed of light in vacuum is 1.6 times faster than that in the medium
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