일반물리학 2 — Electromagnetic Waves: Problem 12

12 In Fig. 33-30, unpolarized light is sent into a system of three polarizing sheets, which transmits 0.0450 of the initial light intensity. The polarizing directions of the first and third sheets are at angles $\theta_1 = 0^\circ$ and $\theta_3 = 90^\circ$. What are the (a) smaller and (b) larger possible values of angle $\theta_2$ ($< 90^\circ$) for the polarizing direction of sheet 2?