Two convex lenses of same focal length but of aperture $A_1$ and $A_2\; (A_2 < A_1)$ are used as the objective lenses in two astronomical telescope having identical eye pieces. What is the ratio of then resolving power ?

Question

$\begin{array}{1 1} \large\frac{A_1}{A_2} \\ \large\frac{A_2}{A_1} \\ A_1=A_2 \\ none\;of\;these \end{array} $