A beam of light traveling horizontally is made of an unpolarized component with intensity $I_0$ and a polarized component with intensity $I_p$. The plane of polarization of the polarized component is oriented at an angle $\theta$ with respect to the vertical. $\textbf{Figure P33.59}$ is a graph of the total intensity $I_{total}$ after the light passes through a polarizer versus the angle a that the polarizer's axis makes with respect to the vertical. (a) What is the orientation of the polarized component? (That is, what is $\theta$?) (b) What are the values of $I_0$ and $I_p$?