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Laser light of an unknown wavelength falls incident on a pair of slits separated by 25.0...

Laser light of an unknown wavelength falls incident on a pair of slits separated by 25.0 µm. This produces an interference pattern on a screen 1.80 m away with the first-order bright fringe being 39.7 mm from the center of the central maximum. What is the wavelength of the laser light?

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