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At the end of Section 36.4, the following statements were made about an array of N slits. Explain, using phasor diagrams, why each statement is true, (a) A minimum occurs whenever ϕ is an integral multiple of 2π/N, except when ϕ is an integral multiple of 2π (which gives a principal maximum). (b) There are (N−1) minima between each pair of principal maxima.
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