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In an interference experiment, a laser of wavelength 670 nm is passed through two parallel slits...

In an interference experiment, a laser of wavelength 670 nm is passed through two parallel slits separated by 0.25mm. An interference pattern is formed on the screen placed at a distance of 90 cm from the slits. What is the distance between the 3rd bright fringe above the cbf and the 3rd dark fringe below the cbf?

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