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A two-slit arrangement with 60.3 mm separation between the slits is illuminated with 491.0 nm coherent...

A two-slit arrangement with 60.3 mm separation between the slits is illuminated with 491.0 nm coherent light. If a viewing screen is located 4 m from the slits, find the distance from the first dark fringe on one side of the central maximum to the second dark fringe on the other side.

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