Lecture 34 - Dispersion. Polarization. Huygen's principle

Lecture 34 - Dispersion. Polarization. Huygen's principle -...

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1 Lecture 34 Dispersion Polarization Dispersion. Polarization. Huygen s principle. Polarized light x y z E -field is oriented in a particular direction (wave is said to be polarized in that direction). Natural light is unpolarized. Example: light-bulb: -field is in random directions (the decay of excited atoms has no fixed orientation) 0 ˆ ˆ (cos sin ) cos( ) j kE kx t   0 Polaroid filters Polaroid sheets or filters: long molecules lined up in stretched sheets Light is sent through sheet: -field in one direction passes through sheet Polarized light through a polarizing filter Linearly polarized light is shone on a polarizing filter. The direction of the field makes an angle θ with the filter s transmission axis ( direction). Only the projection of the -field is transmitted through the filter. 0 cos EE Transmitted light is now polarized in Intensity of light 2 IE For the transmitted light, 2222 0 cos EEE  2 0 cos II Law of Malus the direction of the filter ( ).
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This note was uploaded on 09/21/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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Lecture 34 - Dispersion. Polarization. Huygen's principle -...

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