Question

Unpolarized light with intensity 274.56 W/m2 passes first through a polarizing filter with its axis vertical, then through a polarizing filter with its axis 31.69o from vertical. What light intensity emerges from the second filter ?

Answer 1

$\begin{gathered} I=I_0\cdot cos^2(\theta) \\ \text{ For the firts filter} \\ I=274.56\cdot cos^2(0) \\ I=274.56W/m^2 \end{gathered}$$\begin{gathered} \text{ For the second filter} \\ I=274.56\cdot cos^2(31.69) \\ I=198.79W/m^2 \end{gathered}$