Question

The Speed Of Light in a transparent medium is 1.8 ×100000000 m/s . Find The Refractive Index Of That Medium

Answer 1

the speed of light in vaccum =3x10^8 m/s

speed of light in a transparent medium
=1.8 x 10^8 m/s

refractive index
= (3x10^8)/(1.8x10^8)
=10/6

Answer 2

The refractive index is given by
n=c/v
Where n is the refractive index
c is the speed of light in vaccum
v is the speed of light in that medium
It is given that speed of light in a medium(v) is1.8*100000000=1.8*10^8m/s
Speed of light in vaccum=3*10^8m/sec

n=3*10^8/1.8*10^8
n=3/1.8=1.6666......=1.67(approx)