Question: Red plane waves from a ruby laser ( = 694.3 nm) in air impinge on two parallel slits in an opaque screen. A fringe pattern

Red plane waves from a ruby laser ( = 694.3 nm) in air impinge on two parallel slits in an opaque screen. A fringe pattern forms on a distant wall, and we see the fourth bright band 1.0 above the central axis. Kindly calculate the separation between the slits

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