Refractive index of a medium is 2.5. it means that,
* 1)Speed of light in that medium is 2.5 times the speed of light in water.
2)Speed of light in that medium is (1/2.5) times the speed of light in water.
3)Speed of light in that medium is 2.5 times the speed of light in vacuum.
4)Speed of light in that medium is (1/2.5) times the speed of light in vacuum
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speed of light in that medium is 2.5 times the speed of light in water
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