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Drag the yellow detector slowly across the light shown on the screen (in the top panel, slit width and position grid units are in microns (10⁻⁶ m) while on the graph, position is given in cm and intensity is in arbitrary units, scaled so that the maximum intensity is 1). If the distance to the screen is 20.0 cm, what is the wavelength of the light?  Restart.

Problem by Andrew Duffy and Anne J. Cox