1. The problem statement, all variables and given/known data In a double-slit interference experiment the slit separation is 8.40 x 10-6 m and the slits are 2.80 m from the screen. Each slit has a width of 1.20 x 10-6 m. 2 lights of wavelength 450nm and 600nm are shone on the same slits. If both of the above light sources are shined on the slits at the same time, which order bright fringes from the two light sources would occur at the same locations on the screen? Include the orders of all possible fringes that would overlap. 2. Relevant equations dsin = m dsin = (m +0.5) 3. The attempt at a solution Ok so this is part of a multi-part assignment. Using the equations above I've determined "how far (in meters) from the center of the interference pattern on the screen will the third order (m = 3)" be for the bright (450) and dark (600) fringes separately. The next part of the question asks about shining them at the same time and about bright fringe orders. My guess was to set both equations equal to each other without m and having both dsin cancel out leaving m = (m + 0.5) and calculating for the order, but I realize this will only give me potentially one answer so I feel like my methods are incorrect. Could someone give me some guidance about how to approach this question?