1.

Refractive index of water is 4/3. calculate the speed of light in water. Speed of light in vacuum is 3xx10^(8)ms^(-1).

Answer»

Solution :Refractive index of WATER=`("speed of light in VACUUM")/("speed of light in water")`
`therefore (4)/(3)=(3XX10^(8))/("Speed of light in water")`
or Speed of light in water`=(3)/(4)XX(3xx10^(8))`
`=2*25xx10^(8)ms^(-1)`


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