Question

if refractive index of glass is 3/2, then what is the speed of light in glass??

Answer 1

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 = 2×10⁸ m/s

Answer 2

we know that,
μ=$\frac{speed of light in vacuum}{speed of light in medium}$
given ,
μ=3/2
⇒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