Suppose that we have an incoherent, quasimonochromatic, uniform slit source, such as a discharge lamp with a mask and fitter in front of it. We wish to illuminate a region on an aperture screen 10.0 m away, such that the modulus of the complex degree of coherence everywhere within a region 1.0 mm wide is equal to or greater than 90% when the wavelength is 500 nm. How wide can the slit be?
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