Consider three equally spaced and equal$-$intensity coherent sources of light $($such as adding a third slit to the two slits$).$ Use the phasor method to obtain the intensity as a function of the phase difference $.$

Express your answer in terms of $.$

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Part B

Determine the positions of maxima.

Express your answer in terms of the the wavelength $,$ the space between the coherent sources $d,m=0,1,2,$dots, and appropriate constants.

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