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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 1.5^o By what distance does the central maximum on the screen move?

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