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Refractive index = 3/2
let speed of light in medium = v
speed of light in vacuum = 3×10⁸ m/s

refractive index of a medium = speed of light in vacuum/speed of light in medium
⇒3/2 = 3×10⁸/v
⇒v = 3×10⁸×2/3
⇒ v= 2×10⁸ m/s

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Refractive index of amedium=speed of lightin vaccum/speed of light inmedium -glass    then speed of light in glass=v then 3/2=2.9 x10^8/v  3v=2.9 x10^8x2          v=5.8 x10^8/3 =1.9 x10^8m/s
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