Figure shows two isotropic point sources of light (S1 and S2) that emit in phase at wavelength 400 nm and at the same amplitude. A detection point P is shown on an x axis that extends through source S1. The phase difference Φ between the light arriving at point P from the two sources is to be measured as P is moved along the x axis from x = 0 out to x = + ??. The results out to xs = 10 x 70-7 m are given in Figure On the way out to + ??, what is the greatest value of x at which the light arriving at P from S1 is exactly out of phase with the light arriving at P from S2?

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x (10-7 m) (rad)