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Calculate the time taken by light to tra...

Calculate the time taken by light to travel a distance of `10 km` in water of refractive index `4//3`.

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Here, `t = ? S = 10 km = 10^(4)m`
`mu = 4//3`
`t = (s)/(v) = (s)/(c//mu) = ((4)/(3) xx 10^(4))/(3 xx 10^(8))s`
`= 4.44 xx 10^(-5)s`
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