## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

$\theta_c = 76.7^{\circ}$
We can find the critical angle: $\theta_c = sin^{-1}~(\frac{n_2}{n_1})$ $\theta_c = sin^{-1}~(\frac{1.46}{1.50})$ $\theta_c = 76.7^{\circ}$