We suggest that a reflector is flat: z=H.
First step: We represent travel-time dependence for common source gathered in a true model in the following form:
Second step: Reverse Eiconal's continuation can be determined with help of ray's equations
Third step: The location of the reflector's image can be found from the condition , that is
Having usage of equations (76), (77), (78), and (79), we derive
Now we substitute this formula into equations (77) and (78) and finally get parametric descriptions of the reflector image: