Monochromatic coherent light of amplitude E, and angularfrequency w passes through three parallel slits, each sepa-rated by a distance d from its neighbor. (a) Show that thetime-averaged intensity as a function of the angle 0 isI(0) = I(2nd sin e1+ 2 cosmax(b) Explain how this expression describes both the primaryand the secondary maxima. (c) Determine the ratio of theintensities of the primary and secondary maxima. Hint: SeeProblem 16.

a) The resultant amplitude is Er =Eosinωt + Eosin (ωt +ϕ) + Eosin (ωt +2ϕ) where ϕ=2πλd…

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