The time taken by a monochromatic light ...

The time taken by a monochromatic light to travel a certain distance in air in `9 xx 10^(-6)` seconds. The time taken by the light ray to travel the same distance in water of refractive index `(4)/(3)` is

12 s

`12mu` s

`27/4mu` s

`27/2mu` s

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