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Phys132 - Spring 2007 - Light-Polarization
Course: PHYS 132, Fall 2009School: Delaware State
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132 Electromagnetic Physics Radiation April 19, 2007 Physics 132 Electromagnetic Spectrum April 19, 2007 1 Physics 132 Frequency and Wavelength April 19, 2007 Like all waves, EM radiation has a frequency and wavelength that are related. v = c = f The speed of light is c = 3.00 108 m/s Example: What is the highest frequency of visible light? 3 108 m/s = 7.5 1014 Hz f = = 400 10-9 m v Physics 132...
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132
Electromagnetic Physics Radiation
April 19, 2007
Physics 132
Electromagnetic Spectrum
April 19, 2007
1
Physics 132
Frequency and Wavelength April 19, 2007
Like all waves, EM radiation has a frequency and wavelength that are related.
v = c = f
The speed of light is c = 3.00 108 m/s Example: What is the highest frequency of visible light?
3 108 m/s = 7.5 1014 Hz f = = 400 10-9 m v
Physics 132
Intensity
April 19, 2007
Like sound waves, light waves have an intensity which measures the amount of power that hits a surface.
Definition : I = P A Often : I = P 4R 2
If light spreads out as it leaves a source, the intensity obeys 1/R2 relationship with distance. Intensity is also the Brightness of the light.
2
Physics 132
Electromagnetic Radiation
April 19, 2007
Physics 132
Unpolarized Light
April 19, 2007
The electric field of unpolarized light points randomly in all directions.
3
Physics 19, 132
Polarizers
April 2007
A Horizontal Polaroid
Physics 132
Ideal Polarizers
April 19, 2007
I = I cos With Incoming Polarized Light
2 out in
With Incoming Unpolarized Light
I out = I in / 2
Either Way, Output Light is Polarized.
4
Physics 132
Pair of Polarizers
April 19, 2007
First Polarizer Polarizes and Cuts Light in Half Second Polarizer Changes Polarization and Reduces Intensity by cos2
I out = (I in / 2 ) cos 2
Only the difference in angles matters. If Polarizers are "crossed", no light ge...
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