The refractive index of water is 4/3 and the speed of light is 3×10^8meter per second .Find the speed of the light in water
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Refractive index of a medium = Speed of light in vacuum/Speed of light in a medium
1.3 = 3 x 108 / Speed of light in medium
Speed of light in the medium = 3 x 108 /1.3 m/s
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