Interference

IB Physics: Interference

Although it"s not in the syllabus I like to show how the rotating vector model can be used to model the addition of the two light sources. Then use the small angle approximation to show that s = λD/d. Using Geogebra you can animate the whole thing and show that the intensity distribution = cos2(θ/2).The two vectors represents the addition of waves from two slits at different angles. The graph shows the resultant2


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