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Two sources of light waves of equal frequency and amplitude are shown. The magnitude of the electric field is represented by the light and dark areas. The lighter the spot, the greater the magnitude of the electric field at that spot (position is given in arbitrary units). Restart. At the points indicated (A, B, C, D), is the interference of the waves from the two sources maximally constructive, completely destructive, or somewhere in between?

This applet calculates seven frames and then runs continuously. For a large number of sources, or for very small wavelengths, this calculation can take some time, so let the applet finish calculating all seven frames.