**Intensity in Double-Slit Interference**

Equations 36-14 and 36-16 tell us how to locate the maxima and minima of the double-slit interference pattern on screen C of Fig. 36-8 as a function of the angle o in that figure. Here we wish to derive an expression for the intensity I of the fringes as a function of O. The light leaving the slits is in phase. However, let us assume that the lightwaves from the two slits are not in phase when they arrive at point P. Instead. the electric field components of those waves at point P are not in phase and vary with time as

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