Question: Two narrow slits in a thin metal sheet are 2.70 mm apart centerto-center. When illuminated directly by plane waves (in air) a fringe pattern appears

Two narrow slits in a thin metal sheet are 2.70 mm apart centerto-center. When illuminated directly by plane waves (in air) a fringe pattern appears on a screen 4.60 m away. It is found that measuring from the center of any one dark fringe to the center of the minimum five dark fringes away is a distance of 5.00 mm. Determine the illuminating wavelength.

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