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prallech24 - Chapter 24 Wave Optics Remember Particle Wave...

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1 Chapter 24 Wave Optics What is the color of gasoline? Remember: Particle Wave Duality of Light 24.1 Conditions for Interference t +1 -1 t +1 -1 t +2 -2 + Constructive Interference In Phase
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2 t +1 -1 t +1 -1 t +2 -2 + Destructive Interference Out of Phase 180 degrees 90 180 270 360 Interference for Sound … For example, a pair of speakers, driven in phase, producing a tone of a single f and l : l 1 l 2 If l 2 - l 1 = l /2, there is no sound at all!
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3 Interference for Light … Interference for Light … Can’t produce coherent light from separate sources (it oscillates too fast for us to control). (f 10 14 Hz) Single source Two different paths Interference possible here Need two waves from single source taking two different paths
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