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A light ray falling at an angle of 45° with the surface of a clean slab of ice of thickness 1.00 m

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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 x 108 m/s.

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Distance travelled by light in the slab is,

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