A small object stands $30\ \text{cm}$ in front of a thin convex lens of focal length $20\ \text{cm}$. A plane mirror is placed $50\ \text{cm}$ behind the lens, perpendicular to its axis, as shown in the figure. Light from the object passes through the lens, reflects from the mirror, and passes back through the lens. The final image is

Fig. 1: An object 30 cm in front of a convex lens of focal length 20 cm, with a plane mirror 50 cm behind the lens.