Part A Two slits spaced $0\mathrm{.}260$mm apart are $0\mathrm{.}980$m from a screen and illuminated by coherent light of wavelength $640$nm$.$ The intensity at the center of the central maximum $($$=0^)$ is I$\_0.$ What is the distance on the screen from the center of the central maximum to the first minimum? Express your answer with the appropriate units. Part B What is the distance on the screen from the center of the central maximum to the point where the intensity has fallen to I$\_0/2?$ Express your answer with the appropriate units.