In Lloyd's mirror experiment (Fig.) a light wave emitted directly be the source S (narrow slit) interferes with the wave reflected form a mirror M. As s result, an interference fringe pattern is formed on the screen Sc. the source and the mirror are separated by a distance l=100 cm. At a certain position of the source, the fringe width on the screen was equal to Δx=0.25 mm, and after source was moved away from the mirror plane by Δh=0.60mm, the fringe width decreased η=1.5 times. Find the wavelength of light.
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