In a youngs double-slit experiment the 7th dark fringe is, Ask an Expert

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In a Young's double-slit experiment, the 7th dark fringe is located 0.029 m to the side of the central bright fringe on a flat screen, which is 1.1 m away from the slits. The separation between the slits is 1.5 x 10^-4 m. What is the wavelength of the light being used?

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