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In a medium the speed of light wave decr...

In a medium the speed of light wave decreases to `0.2` times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is `x:1.` The value of `x` is ______ .(Given speed of light in free space `=3times10^(8)ms^(-1)` and for the given medium `mu_(r=1))`

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