1. In a Young's double-slit experiment, the seventh dark fringe is located 0.029 m to the side of the central bright finge on a flat screen, which is 1.1 m away from the slits. The separation between the slits is 1.5 x 10^-4 m. What is the wavelength of the light being used? 2. wavelength = d sin(theta) Tan theta = y/x y= 0.029m x= 1.1m d = 1.5 x 10^-4 m 3. Tan Theta = y/x = 0.029/1.1= 0.0264 Theta = 1.51 Wavelength = d sin (theta) = (1.5 x 10^-4) x 0.0264 Wavelength = 3.95 x 10^-6 This is not correct and I can't seem to place why. Any thoughts?