Need help with mirror question

mirror An object is placed 4.0 cm in front of a thin converging lens of focal length 2.0 cm, which is placed 7.0 cm in front of a spherical mirror of an unknown type. You see the image at 12.36 cm on the right of the original object {the very original object-the one that's 4.0 cm to the left of the lens). (a) What is the type of the mirror? O Concave. O The one in Snow White. O Convex. 0 Flat. (b) Following the last question, what is the focal length of the mirror? 0 - 0.95 cm