A light ray falling an agnle of 60^(@) ...

A light ray falling an agnle of `60^(@)` with the surface of a clean slab of thickness `1.00m` is refracted into, it an angle of `15^(@)`. Calculate the time taken by the light rays to cross the slab. Speed of light in vacumm `= 3xx10^(9) m//s`

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The correct Answer is:

`2//3 xx 10^(-8)sec`

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