Define the pole of a mirror

An objects is placed at a distance equal to focal length of convex mirror.If the focal length of the irror be f,then the distance of the image from the pole of the mirror is:

An object placed 12 cm from the pole of a concave mirror produces a real image magnified four times.Find the radius of curvature of the mirror.

A concave mirror s placed on a horizontal table with its axis directed vertically upwards.Let O be the pole of the mirror canc C its centre of curvature.A point object is placed at C.It has a real image ,also located at C.If the mirror is now filled with water ,the image will be:

Define the terms:Pole

Define the focal length of mirror

Define a spherical mirror.

Define spherical mirror, centre of curvature, radius of curvature, pole, principal axis and focal length of spherical mirror.

Define the terms: concave mirror convex mirror