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The reason for using two slits in a Young's Double Slit experiment is to create a path difference. allow separate passage for frequency and wavelength. double the intensity provide two coherent light sources What kind of sources are required for Young's Double slit experiment? Bright Incoherent Coherent Intense In the equation d sin = n2, n in the equation is referring to the number of slits. the slit separation the slit width the order of the bright fringe