Determine the refractive index of a medium if the speed of a light in the medium is 1.8×1000000000m/sec
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Refractive index = speed of light in air or vaccum/speed of light in any other medium
= 3×10^8 /1.8 × 10^10
=30/18 × 1/10^2
=1.12 × 10^2
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