Coherent light from a sodium-vapor lamp is passed through a, Ask an Expert

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Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. It then falls on two slits separated by 0.420mm . In the resulting interference pattern on a screen 2.16m away, adjacent bright fringes are separated by 2.78mm

What is the wavelength of the light that falls on the slits?

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