The absolute refractive index of glass and water are 4/3 and 3/2 respectively. If the speed of light in glass is 2 * 108 m/s, calculate the speed of light in (i)vacuum, (ii)water.
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1- 2.6*108 m s-1
2- 1.73*108 m s-1
2- 1.73*108 m s-1
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