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Monochromatic light from a distant point source is incident on two slits. The width of each slit is a and the distance between the centers of the slits is d. The resulting graph of relative intensity versus θis shown at right. (The center of the pattern is at
Sketch the relative intensity graph that would result when each of the following changes is made. Your graphs should show the approximate locations of the maxima and minima and be qualitatively correct as to the relative sizes of the maxima. Explain your reasoning.
c. A third slit of width a is added to the right of the existing slits, while keeping the distance between adjacent slits (d) fixed.
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