Go back to the original settings. Consider that the fringe spacing is of the order of cm separations and the distance to the screen is several meters (4.33 m). Thus, the angle is small (\theta \sim 10^{-2}/4.33 = 2 \times 10^{-3}~ radiansθ∼10 −2 /4.33=2×10 −3 radians) and we can apply the small angle approximation. From the values you can obtain from the interference pattern, calculate the wavelength of the red laser?