The radius of curvature of a convex mirror is x. The distance of an object from the focus of this mirror is y. What is the distance of the image from the focus?

A

$$\frac{y^2}{4x}$$

B

$$\frac{x^2}{y}$$

C

$$\frac{x^2}{4y}$$

D

$$\frac{4y^2}{x}$$