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Question
Figure 27.56 shows a double slit located a distance x from a screen, with the distance from the center of the screen given by $y$ . When the distance $d$ between the slits is relatively large, there will be numerous bright spots, called fringes. Show that, for small angles (where $\sin{(\theta)} \approx \lambda$ , with $\theta$ in radians), the distance between fringes is given by $\Delta y = \dfrac{x\lambda}{d}$Δy = xλ / d .
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Please see the solution video for the derivation.
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