# lec19 - 1 Interference...

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Unformatted text preview: 1 Interference http://content.answers.com/main/content/img/CDE/_CDVSDVD.GIF http://www.sonic.net/~ideas/graphics/mma_cd.gif 11/2/10 2 Interference When two waves with the same frequency f and wavelength λ combine, the resultant is a wave whose amplitude depends on the phase different, δ . 11/2/10 3 Interference: Phase Differences -2-1.5-1-0.5 0.5 1 1.5 2 0 20 40 60 80 100 Amplitude (arbitrary units) Position (arbitrary units)-4-3-2-1 1 2 3 4 0 20 40 60 80 100 Amplitude (arbitrary units) Position (arbitrary units)-3-2-1 1 2 3 0 20 40 60 80 100 Amplitude (arbitrary units) Position (arbitrary units) δ = 0 or 1 λ δ = 0.5 λ δ = 0.3 λ Constructive Interference Destructive Interference 11/2/10 4 Interference: Phase Differences Constructive Interference Destructive Interference 2 11/2/10 5 Coherence *If the difference in phase between two (or more) waves remains constant ( i.e., time-independent), the waves are said to be perfectly coherent . *A single light wave is said to be coherent if any two points along the propagation path maintains a constant phase difference....
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lec19 - 1 Interference...

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