# Article

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Keywords:
3-dimensional potential problem; Ritz-Galerkin approximation; convergence; diffraction; nonlocal boundary condition; finite elements
Summary:
Assuming an incident wave to be a field source, we calculate the field potential in a neighborhood of an inhomogeneous body. This problem which has been formulated in \$\bold R^3\$can be reduced to a bounded domain. Namely, a boundary condition for the potential is formulated on a sphere. Then the potential satisfies a well posed boundary value problem in a ball containing the body. A numerical approximation is suggested and its convergence is analyzed.
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