Answer :

TPS
refractive index of a medium = speed of light in vacuum / speed of light in a given medium
let the speed of light in glass = v

thus 3/2 = 3×10^8 / v
⇒v = 3×10^8 ×2/3
⇒ v = 2×10^8 m/s

Neyaz786
we know that
 refractive index of de medium=speed of light in vaccuum/speed of light in given meium.
let speed of light in glass=x
then
3/2=(3*10^8)/x
x=2*10^8

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