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the speed of light changes as it moves from one medium to another
assuming that speed of light in air is 3*108 m/s
the speed of light in water is taken as 2.25 x 10^8 m/s as it is 3/4 of speed of light in vaccum !
Normally for such questions , the value will be given , but if they aren't given then keep it as a constant as it will get cancelled out later .
Hope that helps
Please approve !
In special relativity, the speed of light in ANY formula, in ANY medium(including water), should always be taken as the speed of light in vacuum, which is a CONSTANT.
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