A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an inverted image of the object coincident with it
| A. |
12 cm |
| B. |
30 cm |
| C. |
50 cm |
 |
| D. |
60 cm |