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Double-slit interference pattern

Light from a He-Ne laser ( lambda = 632.8 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.20 m from the slits. Figure 28-34 shows the interference pattern observed on the screen. What is the slit separation?

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This solution is provided in 94 words in both .doc and .pdf formats. Diagrams are included to further understanding of the problem and solve for distance between slits.