Question: Mirror M1 in Figure 37.22 is displaced a distance L. During this displacement, 250 fringe reversals (formation of successive dark or bright bands) are counted.

Mirror M1 in Figure 37.22 is displaced a distance ∆L. During this displacement, 250 fringe reversals (formation of successive dark or bright bands) are counted. The light being used has a wavelength of 632.8 nm. Calculate the displacement ∆L.

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