lecture 20

lecture 20 - 24.6 Polarization EM waves are transverse...

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24.6 Polarization EM waves are transverse waves and can be polarized. Consider the electric field part of an EM wave. It oscillates up and down as the wave propagates: Thus, the wave oscillations are perpendicular to the direction of travel and occur in only one direction. e refer to this wave as nearly polarized We refer to this wave as linearly polarized . A vertical slit would allow the wave to pass through, since the slit is A horizontal slit would block the wave and not allow it to pass, ince the slit is perpendicular to parallel to the oscillations: Direction of since the slit is perpendicular to the oscillations: electric field
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So how is polarized light produced? We could use the antenna on a radio station: Antenna - The up and down vibrations of the electrons in the antenna produce polarized waves whose direction is determined by the orientation of the antenna. Incandescent light is unpolarized , resulting from many atoms vibrating in all possible orientations. ntenna Incandescent ight Antenna Light -
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We can convert unpolarized light into polarized light by blocking all but one of the electric field orientations. device that does this is called a olarizer or polaroid A device that does this is called a polarizer or polaroid .
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lecture 20 - 24.6 Polarization EM waves are transverse...

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