The convex mirror always produces a virtual, diminished and erect image of the object.

If the object is at infinity in front of a convex mirror the image is formed at infinity.

An object is placed at distance of 3 cm from a plane mirror. The distance of the object and image is 3 cm.

The distance from centre of curvature of the mirror to the pole is called the focal length of the mirror.

When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.