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

The ray's direction of travel in the glass is $~~35^{\circ}~~$ from the normal.
We can use Snell's Law: $n_3~sin~\theta_3 = n_2~sin~\theta_2 = n_1~sin~\theta_1$ $n_3~sin~\theta_3 = n_1~sin~\theta_1$ $sin~\theta_3 = \frac{n_1~sin~\theta_1}{n_3}$ $sin~\theta_3 = \frac{(1)~sin~60^{\circ}}{1.50}$ $sin~\theta_3 = 0.57735$ $\theta_3 = sin^{-1}~(0.57735)$ $\theta_3 = 35^{\circ}$ The ray's direction of travel in the glass is $~~35^{\circ}~~$ from the normal.