A laser beam, with a wavelength of 532 nm, is directed exactly perpendicular to a screen having two narrow slits spaced 0.15 mm apart. Interference fringes, including a central maximum, are observed on a screen 2.5m away. The direction of the beam is then slowly rotated around an axis parallel to the slits to an angle of 1.5o By what distance does the central maximum on the screen move?