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Old Mar 15th 2012, 02:15 AM   #1
Join Date: Oct 2008
Posts: 66
Reflection and polarization

Hey, I was wondering if anyone could lend me a hand interpreting this problem text:

"A linearly polarized laser beam in air hits a glass surface (n=151) at an angle equal to the Brewster angle and is reflected towards a Polaroid, that is tilted 30 from the lasers oscillating electric field."

Now, what I'm supposed to calculate in the end is the electric field vector amplitude after the reflection and Polaroid. If the light had been not been polarized from the start, it would have been so after the reflection and thus the resulting intensity falling onto the Polaroid would have been half that of the initial, with corresponding effect for the amplitude, right? Which means, as far as I understand it, that since this initially linearly polarized light is reflected, the reflection has no effect on the intensity?
Also (yea, I know) would you agree that what they mean with the 30 degree angle is simply the direction of polarization incident on the Polaroid, to be plugged into Malu's law as usual?
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polarization, reflection

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