# Malus' Law (Polarization) [closed]

Consider the image below:

Let $\theta_2$ be the angle between the axes of transmission of Polarizer 2 and Polarizer 3 and $\theta_3$ be the angle between the axes of transmission of Polarizer 3 and Polarizer 4.

Derive $I_4$, in terms of $I_2$, $\theta_2$ and $\theta_3$.

Any idea how to do this one?

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Hint: apply Malus's law to each polarizer. –  DaniH Dec 4 '12 at 22:24