... metre rulers. * The distance across a number of fringes is measured with a normal ruler to determine the fringe spacing(x). Results Nine bright fringes were produced on the screen. To calculate the fringe separation, the length across a number of bright fringes is divided by the number of dark fringes separating them. 4.5 = 0.5625cm 8 = 0.005625m Treatment of Results There is now enough information to determine the wavelength of the laser using the following equation: ? = xs where x = fringe separation d s = double slit d = distance between slits and screen ? = 0.005625 x 0.00025 2.075 ? = 0.000000677m = 6.7 x 10( m = 670 x 10( m = 670 nm Conclusion When the laser was turned on it diffracted at the two slits producing two waves. Two source superposition took place as the waves overlapped travelling in the same direction. The ...

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