Question

The time taken by a monochromatic light to travel A certain distance in air in 9 into 10 to power minus 6 second the time taken by light to travel the same distance in water of refractive index 4 by 3 is option A 12 second option B 12 Mu second option C 27 by 4 mu seconds and option D 27 by 2 mu seconds

Answer 1

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Answer 2

if it is so long in which class you read I am tired by reading this question