Consider two point sources of light separatedby distance d and located symmetrically aboutthe orgin as shown in the figure (not to scale).The two sources create waves which interfere(x, y)on an observation screen. Consider a point onthe observation screen with coordinates (x, y).To determine the type of interference(constructive, destructive, or partial) we needto calculate the path length difference. Tosimplify calculations, we often use theinterference approximation. We thus have two expressions for the path length difference:Arexact = r2 –rị , Arapprox = d sin 0How good is the interference approximation? Let us investigate this questions in twodifferent cases. a) Suppose d = 1 and (x, y) = (3,2). All numbers are in SI units.Calculate Arexact, Arapprox, and the percent difference between them. b) Suppose d =1 and (x, y) = (30,20). All numbers are in SI units. Calculate Arexact, Arapprox, and thepercent difference between them.

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Answered: Consider two point sources of light…

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