http://en.wikipedia.org/wiki/Interference_%28wave_propagation%29 [2]
http://www.physicsclassroom.com/class/waves/Lesson-3/Interference-of-Waves [3]
http://en.wikipedia.org/wiki/Interference_%28wave_propagation%29 [2]
http://www.colorado.edu/physics/phys1230/phys1230_fa03/Ch12Lectures.htm [4]
http://www.people.fas.harvard.edu/~djmorin/waves/interference.pdf [5]
Links
[1] https://hootsgo.org/?q=node/6407
[2] http://en.wikipedia.org/wiki/Interference_%28wave_propagation%29
[3] http://www.physicsclassroom.com/class/waves/Lesson-3/Interference-of-Waves
[4] http://www.colorado.edu/physics/phys1230/phys1230_fa03/Ch12Lectures.htm
[5] http://www.people.fas.harvard.edu/~djmorin/waves/interference.pdf