2t+1-1t+1-1t+2-2+Destructive InterferenceOut of Phase180 degrees90180270360Interference for Sound …For example, a pair of speakers, driven in phase, producing a tone of a single f and l:l1l2If l2-l1=l/2, there is no sound at all!
3Interference for Light …Interference for Light …•Can’t produce coherent light from separate sources (it oscillates too fast for us to control). (f 1014Hz)Single sourceTwo different pathsInterference possible here•Need two waves from single sourcetaking two different paths
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