Answer to Question #62015 in Optics for Zayna

Question

An object is placed 100 cm in front of a thin lens with focal length 40 cm, which is 200 cm in front of plane mirror. Where is the final image measured from the lens, that would be seen by an eye looking toward the mirror through the lens. What is the transverse magnification of the image? (The light goes from the object through the lens, reflected of the mirror and goes through the lens again.)