2. The problem here is to determine where are the dark fringes are to be found. Light of wavelength 580 nm is incident on a slit of width 0.30 mm. The observing screen is placed 2 meters from the slit. Find the positions of the first dark fringes and the width of the central bright fringe. See figure below. Y2 sin θ 2Na 91 sin θ= Na Intensity Screen Apply equation sin θ = ±-where ml = ±1 Calculate sin θ = m = order number. Let y1 ~ L sin θ = Calculate y1 Find the width of the central bright fringe is 2 l y1 l-