JSIERT

An image is a point or plane to which rays are converged or from which they appear to diverge after the reflection or refraction of light.

The size of the mirror is called its aperture.

The distance between the pole and the focus is called the focal length.

A plane drawn perpendicular to the principal axis and passing through the principal focus.

It is a point on the principal axis at which the rays parallel to the reflection or seem to come from.

The straight-line passing through the pole and the centre of curvature of the mirror is called the principal axis.

The radius of the sphere of which a mirror is a part is called the radius of curvature.

The centre of the sphere of which the mirror is a part is called the centre of curvature.

The central point of a mirror is called its Pole.

A concave mirror or converging mirror has a reflecting surface that bulges inward.