The value of the vector $\vec{A}$ is given as $15$cm, and the focal lenght is $12$cm. Assume that $M$= Center, $F$= Focal point of this concave mirror. What is the size of resulting image?
I've tried to apply the Mirror Formula $\frac{1}{f} = \frac{1}{d_0} = \frac{1}{d_i}$. However, there should be anything I'm missing. Can you correct me?