Hi,(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

I have the following question:

I found two formulas given for the intensity after polarised light went through a polarisation filter.

2. Relevant equations

[tex] I_{1}=I_{0}*\frac 1 2 [/tex]

and

[tex] I_{1}= I_{0}*cos^{2}(\phi)[/tex]

3. The attempt at a solution

Well I don't know when to use which equation. Does it depend on the filter used or does it depend on the angle?

Thanks for your help

edit:

I think when the axis of the filter is parallel to the incoming rays its just 1/2 and when theres an angle between the incoming rays and the filter I have to use the one with cosine.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: POlarisation and intensity

**Physics Forums | Science Articles, Homework Help, Discussion**