A lighted candle is placed in front of a concave spherical mirror so that a real figure is formed behind it (on the left side of the candle). The image of the candle is doubled. The distance between the mirror and the figure is 90cm.

A. What is the distance of the candle from the mirror?
B. What is the radius of curvature of the mirror?
C. Draw the course of the main rays and the resulting figure. Is it straight or upside down?