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Velocity of light in air is 3 xx 10^8 m/...

Velocity of light in air is `3 xx 10^8 m//s` and refractive index of water is 1.33. The time taken by light to travel a distance of 500 m in water is

A

`1.25 mus`

B

`2.22 mus`

C

`12.5 mus`

D

`22.6 mus`

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