\(\theta = 45^\circ \) and \(n = 2\) (Given)
\(\therefore \mu = \tan 45^\circ \left( {1 - \frac{1}{{{2^2}}}} \right) = 1 - \frac{1}{4} = \frac{3}{4} = 0.75\)
$\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\right.$ અને $\left.\tan 37^{\circ}=3 / 4\right)$