What is meant by a parabolic mirror? Explain.

Which mirror is shown in the figure? Where is object placed with respect to the mirror? Write one characteristic of the image formed.

Which mirror is shown in the diagram? Where is object placed in relation to the mirror? Write characteristics of the image formed:

If the focal length of a mirror is +15, then it is______:

Three students $X, Y and Z$ are finding the focal length of the given concave mirror by obtaining the image of the objects elected by them. $X$ obtains the image of the grill of the nearest window of the lab. $Y$ obtains the image of a white painted building near the lab and $Z$ obtains a point size image of the sun. The most correct value of the focal length is obtained by

Identify the concave and convex reflecting surfaces among the two mirrors shown in the figure of both of them have equal focal lengths.