Summary: In my LO, i explain how a 2 source wave interference is created and the ripple ring structure it creates. I then explain how we can take that diagram and evaluate the various crest/trough interference and create a fan digram which can be used for calculations. As there are many different ways of using this diagram to calculate various values, i chose to explain how to use the |d(point2)-d(pointi)|= (n-1/2)λ formula to solve for lambda.

https://www.powtoon.com/show/gpCFmx0hMlE/blackboard2/#/