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Important Terms Related to Spherical Mirror

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Question

Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.

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Solution

Pole:The geometric centre of the spherical surface of mirror is called the pole of mirror.
Principal axis:It is the straight line joining the pole of the mirror to its centre of curvature.
Centre of curvature:The centre of curvature of a mirror is the centre of the sphere of which the mirror is a part.

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Q. The line joining the centre of curvature and the pole of a spherical mirror is known as the principal axis.

Q. Define (a) centre of curvature (b) radius of curvature (c) pole (d) principal axis, and (e) aperture, of a spherical mirror with the help of a labelled diagram.

Explain the following terms :

Pole, Centre of curvature, Radius of curvature, Principal axis.

Show them on separate diagrams for each of the concave and convex mirrors.

Q. State whether true or false :

The principal focus of a spherical mirror lie midway between the pole and centre of curvature.

Q. In the case of a mirror, match the items in column A with those in column B.
A B
1. Centre of curvature (a) centre of the mirror
2. Focus (b) centre of the sphere of which the mirror is a part
3. Radius of curvature (c) point through which all the incident rays parallel to principal axis pass after reflection
4. Principal axis (d) line joining the pole and focus
5. Pole (e) distance between pole and centre of curvature

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