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" "(2)n(1)=(v(1))/(v(2)): :""(1)n(2): ……...

`" "_(2)n_(1)=(v_(1))/(v_(2)): :""_(1)n_(2):` ………………..

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`(v_(2))/(v_(1))` : Velocity of light in a medium depends on the refractive index of the medium.
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