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The interference fringes formed by two coherent sources placed 1.2 mm apart are observed on a screen placed at a distance of 40 cm. If

The interference fringes formed by two coherent sources placed 1.2 mm apart are observed on a screen placed at a distance of 40 cm. If the second dark fringe is at a distance of 10 mm from the center of the fringe, calculate the wavelength of the monochromatic light used. Also calculate the distance of the fourth bright fringe from the central bright fringe.

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