For an amplitude modulated wave , the maximum amplitude is found to be 10 v while the minimum amplitude is found to be $2v$. Determine the modulation index $\mu$ .

Question

$\begin{array}{1 1} \frac{3}{2} \\ \frac{2}{3} \\ \frac{1}{2} \\ \frac{2}{1} \end{array} $