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This document describes an experiment to measure the wavelength of sodium light using a Fresnel biprism. A sodium lamp, slit, biprism, lens, and eyepiece are used to create interference fringes. The fringe width is measured at two biprism-eyepiece distances, then a lens is added to measure the separation between virtual light sources, which allows calculating the wavelength using the fringe width and source separation measurements. The procedure, observations tables, and theory behind how the Fresnel bipris

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