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Calculate time taken by light to travel ...

Calculate time taken by light to travel `1 cm` thickness of glass of `mu = 1.5`.

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`t = (x)/(v) = (x)/(c//mu) = (x mu)/(c ) = (10^(-2) xx 1.5)/(3 xx 10^(8))`
`= 0.5 xx 10^(-10) s`
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