Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

Consider the image below:

enter image description here

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?

share|improve this question

closed as too localized by David Z♦ Dec 4 '12 at 23:12

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

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