
Concept explainers
The photograph at right illustrates the pattern that appears on a distant screen when coherent red light is incident on a mask with two identical, very narrow slits. The two slits are separated by a distance d.
Point C marks the center of the screen. Point X marks a point of zero intensity, and points Y and Z mark maxima.
a. In the space at right below the photograph, clearly label each of the lettered points according to

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