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A light ray falling at an angle of 45^@ ...

A light ray falling at an angle of` 45^@` with the surface of a clean slab of ice of thickness 1.00 m is refracted into it at an angle of 30°. Calculate the time taken by the light rays to cross the slab. Speed of light in vacuum `= 3 xx 10^8ms^-1`

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The correct Answer is:
`2/3 xx10^(-8)` cm
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