A flat object is placed at a distance a = 60 cm in front of a convex spherical mirror, to which a thin positive lens with a focal length F = 20 cm is closely attached. The plane of the object is perpendicular to the optical axis of the system. It turned out that the plane of the object coincides with the plane of the image formed after the passage of light through the lens, reflection from the mirror and secondary passage through the lens. Determine the radius of curvature of a convex mirror.

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