Reflection of Light
3.0 Basic terminologies of spherical mirrors
3.1 Paraxial approximation
3.2 Spherical mirrors
3.3 Sign convention
3.4 Ray tracing
3.5 Image formation by concave mirror
3.6 Image formation by convex mirror
3.0 Basic terminologies of spherical mirrors
3.2 Spherical mirrors
3.3 Sign convention
3.4 Ray tracing
3.5 Image formation by concave mirror
3.6 Image formation by convex mirror
1. Centre of curvature $(C)$: It is the centre of the sphere of which mirror is part.
2. Radius of curvature $(R)$: It is the radius of the sphere of which mirror is a part.
3. Pole $(P)$: It is the geometrical centre of the circular cross-section of the spherical reflecting surface.
4. Principal axis: It is the straight line joining the centre of curvature to the pole.
5. Focus $(F)$: When a narrow beam of rays of light parallel to the principal axis and close to it, is incident on the surface of a mirror. This reflected beam is found to converge or appear to diverge from a point on the principal axis. This point is known as focus.
6. Focal length $(f)$: It is the distance between the pole and the focus.
7. Aperture: The plane surface area of the mirror through which the light rays enter is called aperture.
