Lecture26 - Lecture 26: Polarization Last time we started a...

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Unformatted text preview: Lecture 26: Polarization Last time we started a discussion of polarization Recall that light consists of transverse electric and magnetic field waves i.e., if we were to look at a light wave coming towards us, the fields would be: The electric field direction is called the direction of polarization E B E B E B or or Light coming from the sun or from a light bulb is a combination of waves with all possible polarization directions such light is called unpolarized Light that has all the electric fields aligned in the same direction is called plane polarized or linearly polarized We can produce polarized light from unpolarized light by removing all the portions that dont have electric fields in the direction we want:- = Polarizing Filter Some materials are transparent to light polarized in a certain direction (called the transmission axis ), but absorb electric fields components in other directions these materials typically have long molecules that conduct electricity only along their axes so they absorb light polarized along the molecule axes light polarized perpendicular to the molecules passes through largely unaffected Real polarizing filters (Polaroid) transmit ~80% of light polarized along the transmission axis, and less than 1% of light perpendicular But in the homework and on exams, youll usually be asked to consider an ideal filter that transmits 100% of the light along one direction and 0% along the other...
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This note was uploaded on 08/24/2010 for the course PHYS 142 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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Lecture26 - Lecture 26: Polarization Last time we started a...

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