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# In a Youngs double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.

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#### Distance between the slits, d=0.28×10−3 mDistance between the slits and the screen, D=1.4mDistance between the central fringe and the fourth (n=4) fringe, u=1.2×10−2 mIn case of a constructive interference, we have the relation for the distance between the two fringes as:u=nλD/d⇒λ=ud/nD=6×10−7m=600nm

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