A viewing screen is separated from a double slit by 1.2m. The distance between the two slits 0.030 mm. The Monochromatic light is directed toward the double slit and forms an interference patterns on the screen. The second-order bright-fringe (m=2) is 4.5 cm from the center of the screen.
a) Determine the wavelength of light (in nanometer)
b) Calculate the distance between the 2nd and 3rd order bright fringes.