In Young's double slit experiment, the slits are separated by 0·3 mm and the screen is placed 1·5 m away from the slits. The distance between the central bright fringe and the sixth bright fringe is found to be 1·8 cm. Find the wavelength of light used in the experiment.

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TextYoung's Double Slit ExperimentDiffraction of Light at a Single SlitCBSE PYQ

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A beam of light consisting of a known wavelength 520 nm and an unknown wavelength λ, used in Young's double slit experiment produces two interference patterns such that the fourth bright fringe of unknown wavelength coincides with the fifth bright fringe of known wavelength. Find the value of λ.

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