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This article presents the $A$-dependence of the differential cross sectionfor the coherent electroproduction of vector mesons on nuclei in forwarddirection, at fixed values of longitudinal momentum transfer $q_{L}$. It isshown that such cross section has complicated behavior over the atomic massnumber $A$ with local minimums and maximums. It is also shown that a ratio ofthe real to the imaginary parts of the forward coherent amplitude on nuclei$\alpha_{A} = \Re e{f_{A}} / \Im m{f_{A}}$ has breaking points at some valuesof $A$. Comparison of the behaviors of the normalized cross section$\Big(\frac{d\sigma}{d\Omega}\Big)_{A}\Big/\Big(\frac{d\sigma}{d\Omega}\Big)_{N}$and $\alpha_{A}$ over $A$ shows that the location of minimums of the crosssection are very close to the breaking points of $\alpha_{A}$.

$A$-dependence of coherent electroproduction of $\rho^{0}$ mesons on nuclei in forward direction