With a compass, draw circular arcs representing wave crests originating from each of two point sources a distance d = 6 cm apart for ? = 1 cm. Connect the intersections corresponding to points of constant path difference, and label the path difference for each line. (see Figure 16-8)

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Ar =1 Ar =0 Ar =. Ar = 21 Ar = 32 Ar =21 %3D Ar = 31 ! S2 (b) (a)