Spherical Mirror Terms
Spherical Mirror Terms
Spherical Mirrors:
Spherical mirrors are a special type of curved mirrors in which the surface of the mirror forms a part of a sphere. A highly polished curved surface whose reflecting surface is a cut part of a hollow sphere of a glass or any polished metal is called spherical mirror.
Terms Related to Spherical Mirrors:
The figure below shows the various terms used for spherical mirrors are:
1. Centre of Curvature (C) : It is the centre of sphere of which the mirror is a part.
2. Radius of Curvature (R) : It is the radius of the sphere of which the mirror is a part.
3. Pole (P) : It is the geometrical centre 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 (know as paraxial rays), is incident on the surface of a mirror, the reflected beam is found to converge (concave mirror) or appear to diverge (convex mirror ) from a point principal axis. This point is called focus.
6. Focal Length (f) : It is the distance between the pole and the principal focus. For spherical mirrors
7. Linear Aperture: It is the diameter of the spherical mirror. It is denoted by the distance between A and B.
8. Angular Aperture: It is the angle which the diameter of the spherical mirror subtends at the centre of the hollow sphere of which the spherical mirror is a part.. It is denoted by the angle ACB in the figure.
The distance between the pole and the principal focus is called _________________. | |||
| Right Option : C | |||
| View Explanation | |||
A ray of light falling on a mirror is a ______________ . | |||
| Right Option : D | |||
| View Explanation | |||
_________________ is the geometrical centre of the spherical reflecting surface.
| |||
| Right Option : B | |||
| View Explanation | |||
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