Problem 5.177

A narrow beam of natural light with wavelength $\lambda=$ $=589$ nm falls normally on the surface of a Wollaston polarizing prism made of Iceland spar as shown in Fig. 5.32. The optical axes of the two parts of the prism are mutually perpendicular. Find the angle $\delta$ between the directions of the beams behind the prism if the angle $\theta$ is equal to $30^{\circ}$.