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Finding the distance from source in triple slit interference

Physics Asked by Morgan Gethin Barrett on April 8, 2021

I was wondering about the nature of the 3 slit interference pattern, as shown in fig 1. The line labelled LT/2, matches with fig 2 and all other diagrams I have seen depicting the same thing. I was wondering about the line labelled LT/4, what are the conditions for this alternative pattern, given a set source wavelength, the slit widths and distance between them?

Fig 1:

Fig 2:

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