Not enough lens

The final image \(I\) of the object \(O\) shown in the figure is formed at a point \(20 \text{ cm}\) below a thin biconcave lens, which is at a depth of \(65 \text{ cm}\) from principal axis. From the given geometry, calculate the radius of curvature (in \(\text{cm}\)) of lens kept at \(A\).

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