In a setup like that in Figure 27.7, a wavelength of 625 nm isused in a Young’s double-slit experiment. The separationbetween the slits is d = 1.4 x 10-5 m. Thetotal width of the screen is 0.20 m. In one version of the setup,the separation between the double slit and the screen isLA = 0.21 m, whereas in another version it isLB = 0.23 m. On one side of the central brightfringe, how many bright fringes lie on the screen in the twoversions of the setup? Do not include the central bright fringe inyour counting.
A: Number of bright fringes = 9
B: Number of bright fringes = ??