I don't understand what equation deals with this.
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$\begingroup$ Related (and may be be a possible dupe): physics.stackexchange.com/questions/203979/… and links therein. $\endgroup$– user36790Commented May 20, 2016 at 12:51
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1 Answer
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As a diagram screen $A$ is closer than screen $B$ and so the fringes are closer on screen $A$:
Fringe separation $\Delta x = \dfrac {\lambda \; D}{d}$ where $d$ is the slit separation, $\lambda$ is the wavelength of light and $D$ the distance from the slits to the screen.
