  A double cavity with a quantum mechanical and a classical field is located
immediately behind of a double-slit in order to analyse the wave-particle
duality. Both fields have common nodes and antinodes through which a
three-level atom passes after crossing the double-slit. The atom-field
interaction is maximum when the atom crosses a common antinode and
path-information can be recorded on the phase of the quantum field. On other
hand, if the atom crosses a common node, the interaction is null and no
path-information is stored. A quadrature measurement on the quantum field can
reveal the path followed by the atom, depending on its initial amplitude
$\alpha$ and the classical amplitude $\varepsilon$. In this report we show that
the classical radiation acts like a focusing element of the interference and
diffraction patterns and how it alters the visibility and distinguishabilily.
Furthermore, in our double-slit scheme the two possible paths are correlated
with the internal atomic states, which allows us to study the relationship
between concurrence and wave-particle duality considering different cases.
