Even the polished and smooth curved surfaces can act as mirrors.such mirrors are called spherical mirrors.these mirrors obey the laws of reflection exactly the same way as the plane mirrors.a curved mirror which is a part of a hollow sphere is called sherical mirrors.geometric centre of the spherical mirror is called pole.it is denoted by the letter P.the centre of the hollow sphere of which the spherical mirror is a part is called centre of curvature.an imaginary line passing through the pole is called principle axis.the radius of hollow sphere of which the spherical mirror is a part is called redius of curvature.the distance between pole and principle focas of a spherical mirror is called focal length
