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We have seen that in the medium being considered, the wave paths emanating from a shot-point 0 at the surface are arcs of the circles passing through 0 whose centers lie at a distance vo/a above the surface.

A typical wave path in the section shown in Figure 102 emerges at pickup point P at distance x from 0, the emergence angle there being indicated by ao.

Considering ao as the parameter for the present and noting that the angle made by a wave path at 0 with the vertical is the same as the emergence angle of that wave path at P, we see that as ao varies from 0° to 90°, the point P moves inward from infinite distance toward O.

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