  We study the effect of mirror symmetry for K3 surfaces on D-brane probe
physics. The case of elliptically fibered K3 surfaces is considered in detail.
In many cases, mirror can transform a singular fiber of Kodaira's type ADE into
sets of singular fibers of type I_1 (II) with equal total Euler number, but
vanishing contribution to the Picard number of the mirror surface. This
provides a geometric model of quantum splitting phenomena. Mirror for three
dimensional gauge theories, interchanging Fayet-Iliopoulos and mass terms, is
also briefly discussed.
