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1OrThe following table gives the values of refractive indices of a few media:S.No.2345MediumWater Crown glass Rock salt Ruby DiamondRefractive index 1.33 1.521.54 1.71 2.42Use this table to give an example of (1) a medium pair so that light speeds up when it goes from।one of these media to another. (ii) a medium pair so that light slows down when it goes froone of these media to another.​

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