Question

The speed of light in salt (sodium chloride) is 1.96 x10 8m/s . Calculate the index of refraction for sodium chloride. 

Answer 1

Gives

Light velocity in medium

$v$ =$1.96\times10^8m/sec$

Light velocity in vacuum

$c=3\times10^8m/sec$

n=?

We know that

$n=\frac{c}{v}$

Put value

$n=\frac{3\times10^8}{1.96\times10^8}=1.54$