In a youngs double-slit experiment the seventh dark fringe, Ask an Expert

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In a Young's double-slit experiment, the seventh dark fringe islocated 0.027 m to the side of thecentral bright finge on a flat screen, which is 1.1 m away from theslits. The separation between the slits is 1.6 10-4 m. What is the wavelength of the light being used?

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