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## Homework Statement

A beam of unpolarized radiation is incident upon an electron. Show that the degree of polarization in the light scattered at an angle [itex]\theta[/itex] to the incident beam is [itex]\Pi[/itex] where

[tex]\Pi = \frac{1- \cos^2\theta}{1+ \cos^2 \theta}[/tex].

**2. The attempt at a solution**

This is a Thomson scattering and the polarization is linear so I guess Malus' law must be used, i.e.

[tex]I = I_0 \cos^2 \theta[/tex].

I'm interpreting the degree of polarization as

[tex]\Pi = \frac{I_{max} - I_{min}}{I_{max} + I_{min}}[/tex]

but I cannot get the correct result.