The crests are represented by thick lines and the troughs by thin lines. Several points on the pattern are marked by a dot and labeled with a letter. Use the diagram to answer the following questions. See diagram above for a visual representation of many of the answers. They are all antinodal points and as such, they are the result of constructive interference.
CL are on the central antinodal line.
The central antinodal line is marked on the diagram above as AN 0 . It is the line which extends from the midpoint of the line connecting the two sources. They lie on the first antinodal line to the left or right of the central antinodal line. See diagram above. They lie on the second antinodal line to the left or right of the central antinodal line.