An observer to the right of the mirror-lens combination shown in the figure below sees two real images that are the same size and in the same location. One image is upright and the other is inverted. Both images are 1.90 times larger than the object. The lens has a focal length of 11.6 cm. The mirror and lens are separated with 40.0 cm. Decide the focal length of the mirror. (Don't suppose the figure is drawn to scale.)