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Jan 14, 2016 at 14:28 comment added garyp @D.Labat be careful not to give away too much. We don't want to answer the question for him.
Jan 14, 2016 at 14:19 comment added Dimitri $k$ is the wavevector : $k = \frac{2 \pi}{\lambda}$, $\lambda$ being the wavelenght of the source. Assume $S$ is at the same position as $S_1$ (as it is directly behind it). If we set the original phase of the light in $S$ to be zero, the phase in $S_1$ is thus zero as well, and the phase in $S_2$ is $k*d$, as the light travelled on a distance $d$ from $S_1$ to $S_2$.
Jan 14, 2016 at 14:13 comment added Gummy bears What is $k$? And where did you get this answer?
Jan 14, 2016 at 14:10 history answered Dimitri CC BY-SA 3.0