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I am working in Conduction phenomena Photo-conductivity Experiment. Here the experiment guide . The aim is to measure the photocurrent $I_{Ph}$ as a function of the voltage $U$ at a constant irradiance.

The problem is the photocurrent has the same value when i change the polarization angle from 0 to 30 to 60 to 90. It seems that the polarization filters does not work or does not change the amount of the irradiance. Knowing that i turn off the light while doing this experiment, but there is the sun light coming from high window that i can't cover.

So anyone can help me in that?

Here the result that i should have:
enter image description here

And here my result:

enter image description here

there is no different in the photocurrent of the photo-resistor when i change the the polarization angle between the two filter

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  • $\begingroup$ Did you check whether you are using the filters correctly by just looking at them and noticing a difference in transparency when you rotate one of them? $\endgroup$ – noah Sep 24 at 21:25
  • $\begingroup$ There are different types of polarization filters. Circular polarization filters are ordinary linear polarizers on one side and quarter - wave plates on the other side. You might be using the wrong kind if filter. Test this by reversing one of your filters. $\endgroup$ – S. McGrew Sep 24 at 22:59
  • $\begingroup$ If that doesn't change your results, reverse the other filter. And, try reversing both of them. $\endgroup$ – S. McGrew Sep 25 at 1:34
  • $\begingroup$ thank you all i am going to try these and comeback $\endgroup$ – Hana Sep 25 at 7:56

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