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®3.2.7 Properties of Light
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Polarization:
-Light from the sun is unpolarized
-Molecules in the atmosphere act to polarize sunlight
-Light is most polarized 90o away from the sun
-At sunset, light is most polarized directly overhead
- Coherence:
-Coherent light has the same wavelength and a constant phase relationship
-Laser light is coherent (active systems)
-Propagation through the atmosphere reduces the spatial coherence
-Two points on a wave front separated by a distance greater than
the coherence length are uncorrelated
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