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Refractive index of water is 4//3 and speed of light in air is 3xx10^(8) m//s . Find speed of light in water.

Answer»

Solution :Given : `""_(1)n_(2)=(4)/(3),v_(1)=3xx10^(8)`m/s
TOFIND :`v_(2)`
FORMULA : `""_(1)n_(2)=(v_(1))/(v_(2)`
Solution : `""_(1)n_(2)=(v_(1))/(v_(2)`
`(4)/(3) =(3xx10^(8))/(v_(2))`
`:. v_(2)=(3xx3xx10^(8))/(4)`
`=(9xx10^(8))/(4)`
`=2.25xx10^(8)` m/s


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