You and your team need to estimate the radius of curvature of a panel that had been removed from some unknown object. You were told that the object was spherical and, by the size of the panel (about one square meter in area) and its slight curvature, you estimate that the spherical object from which it came had been quite large. You notice that the outer surface has a mirrored metallic finish (like a convex mirror) and you get an idea. You fi nd a wrench that is 21.0 cm long, and hold it at a distance of 10.0 m from the middle of the mirrored surface. The virtual image of the wrench is 14.5 cm long. Determine the radius of the sphere from which the panel came.