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Refractive index medium = speed of light in vacuum / speed of light in the medium
let the speed of light in glass = v

thus 3/2 = 3×10⁸ / v
⇒v = 3×10⁸ ×2/3
⇒ v = 2×10 m/s
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we know that,
μ= \frac{speed of light in vacuum}{speed of light in medium}
given ,
⇒3/2=3X10⁸/speed of light in glass
⇒speed of light in glass= \frac{3X10^{8}X2 }{3}
⇒speed of light in medium=2X10⁸ m/s