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प्रश्न
How is the refractive index of a material related to the speed of light in it?
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उत्तर
The refractive index is the ratio of speeds of light in the two mediums.
The refractive index of medium 2 with respect to medium 1 is equal to the ratio of speeds of light in medium 1 and in medium 2.
`1^2n=v_1/v_2`
`v_1`=Speed of light in medium 1
`v_2`=Speed of light in medium 2
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