In Figure, two isotropic point sources S_(1) and S_(2) emit light in phase at wavelength lambda and at the same amplitude. The sources are separated by distance 2d = 6.00 lambda. They lie on an axis that is parallel to an x axis, which runs along a viewing screen at distance D = 20.0 lambda. The origin lies on the perpendicular bisector between the sources. The figure shows two rays reaching point P on the screen, at position x_(P). (a) At what value of x_(P) do the rays have the minimum possible phase difference? (b) What multiple of lambda gives that minimum phase difference? (c) At what value of x_(P) do the rays have the maximum possible phase difference? What multiple of lambda gives (d) that maximum phase difference and (c) the phase difference when x_(P)=6.00 lambda? (f) When x_(P)=6.00 lambda, is the resulting intensity at point P maximum, minimum, intermediate but closer to maximum, or intermediate but closer to minimum?