Answer
$n=1.56$
Work Step by Step
We know that the Index of Refraction (n), speed of light (c) and speed (v) are related through the formula:
$n=\frac{c}{v}$
We plug in the known values to obtain:
$n=\frac{3\times 10^8}{1.92\times 10^8}$
$n=1.56$
