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A ray of light passes normally through a...

A ray of light passes normally through a slab `(n = 1.5)` of thickness `t`. If the speed of light in vacuum be `c`, then time taken by the ray to go across the slab will be :

A

`t//c`

B

`3t//2c`

C

`2t//3c`

D

`4t//9c`.

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