68 In Fig. 35-36, two isotropic point sources S, and S2 emit light in phase at wavelength A and at the same amplitude. The sources are separated by distance 2d = 6.00A. They lie on an axis that is parallel to anx axis, which runs along a viewing screen at distance D = 20.0A. The origin lies on the perpendicular bisector between the sources. The figure shows two rays reaching point P on the screen, at position xp. (a) At what value of xp do the rays have the P. Screen D S1 S2 Figure 35-36 Problem 68.

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