It is our intention to produce interference fringes by illuminating some sort of arrangement (Young's Experiment, a thin film, the Michelson Interferometer, etc.) with light at a mean wavelength of 500 nm, having a linewidth of 2.5 X 10-3 nm. At approximately what optical path length difference can you expect the fringes to vanish? [Hint: Think about the coherence length and revisit Problem 7.39.]
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