Speed of light through two media of refr...

Speed of light through two media of refractive indices `mu_(1)` and `mu_(2)` are `u_(1)` and `u_(2)` respectively, then

`u_(1) = u_(2)`

`n_(1)u_(1) = n_(2)u_(2)`

`n_(1)u_(2) = n_(2)u_(1)`

`n_(1)u_(1)^(2) = n_(2)u_(2)^(2)`

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