In a laboratory setup, two slits are separated by 0.25 mm and a screen is placed 1.8 m away. The distance from the central maximum to the first-order bright fringe is measured to be 4.3 mm. What is the wavelength of the light?
a) 9.0×10−7m
b) 6.0×10−7m
c) 3.0×10−7m
d) 1.2×10−6m