Time taken by the sunlight to pass through a window of thickness 4 mm,

1.	Time taken by the sunlight to pass through a window of thickness 4 mm, whose R.I. is 1.5 is:
Answer» `2XX10^10 sec` `2xx10^(-10) sec` `2xx10^(-11) sec` `2xx10^(11) sec` ANSWER :C

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Time taken by the sunlight to pass through a window of thickness 4 mm, whose R.I. is 1.5 is:

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