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The refractive index of diamond is 2.42....

The refractive index of diamond is `2.42`. What is the meaning of this statement ?

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Refractive index of a medium n is related to the speed of light in that medium v by the relation:
`n_m=("Speed of light in vacuum")/("Speed of light in the medium")=c/v`
Where, c is the speed of light in vacuum/air
The refractive index of diamond is 2.42. This suggests that the speed of light in diamond will reduce by a factor 2.42 compared to its speed in air.
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