Two coherent sources are 0.25 mm apart and the fringes are observed on a screen 90 cm away. It is found that with a certain monochromatic source of light, the fifth dark fringe is situated at a distance of l2.8 mm from the central fringe. a) Calculate the wavelength of light and the breadth of a dark fringe, b) Calculate the distance between 12th dark fringe and first bright fringe.

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Q: wavelength

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.