Answer
$38.6^{\circ}$
Work Step by Step
Find the angle of incidence using Snell’s law. Here “1” designates water, and “2” designates air.
$$n_1sin\theta_1= n_2sin\theta_2$$
$$\theta_1=sin^{-1}(\frac{n_2}{n_1}sin\theta_2) $$
$$=sin^{-1}(\frac{1.00}{1.33}sin56.0^{\circ}) =38.6^{\circ}$$