Question

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

• A. 1 - c, 2 - b, 3 - a, 4 - d, 5 - e
• B. 1 - b, 2 - c, 3 - a, 4 - e, 5 - d
• C. 1 - e, 2 - c, 3 - b, 4 - d, 5 - a
• D. 1 - b, 2 - c, 3 - e, 4 - d, 5 - a

Answer 1

Answer: (D)

1 - b, 2 - c, 3 - e, 4 - d, 5 - a

1. Centre of curvature is the centre of the sphere of which the spherical mirror is a part.
   
2. Principal focus is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection, either actually meets (concave) or appears to meet (convex).
3. Radius of curvature is the linear distance between the pole and the centre of curvature.
   
4. Principal axis is an imaginary line passing through the pole and the centre of curvature of a spherical mirror.
   
5. Pole is the mid point of a spherical mirror.
   
6. Focal length is the linear distance between the pole and the principal axis