Last Sunday, Girish's mother, Priyanka, was preparing dinner in her kitchen for Girish and his father. Both of them were so hungry that they sat ideally on their respective chairs and had empty plates and spoons on their dining table. They were shouting like a five years old child that they wanted dinner so eagerly to fill their stomach. At the time, Girish's mother served the cooked food to both of them, and when Girish was just about to eat the rice with the help of a spoon, he noticed that the spoon had such a shining surface that it reflected the light rays incident on it. What is the type of spherical mirror represented by the shining steel spoon?