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