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The refractive index is given by
n=c/v
Where n is the refractive index
c is the speed of light in vacuum
v is the speed of light in that medium
It is given that speed of light in a medium(v)is1.8∗1000=1.3×108 m/s
Speed of light in vacuum=3×10³ m/sec
n=3∗10³ /1.8∗103
n=3/1.8
=1.6666
=1.67
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