One side of radius of curvature R2=120 cm of a convexo-convex lens of material of refractive index u=1.5 and focal length f1=40 cm is silvered. It is placed on a horizontal surface with silvered surface in contact with it. Another convex lens of focal length f2=20 cm is fixed coaxially d=10 cm above the first lens. A luminous point object O on the axis gives rise to an image coincident with it. Find its height above the upper lens.