Diffraction and Interference of Light

Monochromatic light with a wavelength of 4.010−7 meters is incident upon two slits that are 4.0 10−5 meters apart. As a result, an interference pattern appears on a screen 3.0 meters away from the slits and parallel to the slits. What is the expected distance between the central maximum and the next bright line on the screen?

a) 2.0 10−2 m

b) 3.0 10−2 m

c) 4.0 10−2 m

d) 5.0 10−2 m

e) 6.0 10−2 m