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A double slit is illuminated with monochromatic light of wavelength

A double slit is illuminated with monochromatic light of wavelength

A double slit is illuminated with monochromatic light of wavelength 600.0 nm. The m = 0 and m = 1 bright fringes are separated by 3.0 mm on a screen 40.0 cm away from the slits. What is the separation between the slits?

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