Physics 10164 - Spring 2012 - Exam 4C, Problem #2

Light of wavelength 583 nm is incident on two narrow slits separated by 0.35 mm. The slits form a vertically oriented interference pattern on the wall 1.6 meters away. At a vertical distance of 8.0 mm from the center of the pattern, is there a bright fringe or a dark fringe? Justify your answer.