Reflection From Mirrors

Reflection From Mirrors

REFLECTION OF LIGHT ON A SPHERICAL SURFACE
Spherical Mirror:
Mirrors having curved reflecting  surface are called spherical mirrors. A spherical  mirror is a part of a sphere.
Types of spherical mirror: 
Spherical mirrors are of two types - 
1) Concave mirror and 2) Convex mirror.
Concave Mirror: 
Spherical mirror with s reflecting surface curved inwards    is called concave mirror.
Convex Mirror: 
Spherical mirror with reflecting surface curved outwards is called convex mirror.
Important terms in the case of spherical mirror:
Aperture:  The diameter of reflecting surface of a spherical mirror is called aperture.
Pole: The centre of reflecting surface of a spherical mirror is known as Pole. 
Pole lies on the surface of spherical mirror. Pole is generally represented by ‘P’.
Centre of Curvature: The centre of sphere, of which the reflecting surface of a spherical mirror is a part is called the centre of curvature of the spherical mirror. 
i) Centre of curvature is not a part of spherical mirror rather it lies outside the mirror. Centre of curvature is denoted by letter ‘C’.
ii) In the case of concave mirror centre of curvature lies in front of the reflecting surface and in the case of convex mirror centre of curvature lies behind the reflecting surface.
iii) Normal drawn at any point on a shperical mirror, passes through centre of curvature.
Radius of Curvature: 
It is the distance between the centre of curvature and the pole of a spherical mirror.
It is denoted with a letter R.
Principal Axis: 
Imaginary line passing through the centre of curvature and pole of a spherical mirror is called the Principal axis.