The wrong rule of sign convention is :

(i) All distances are measured from the centre of curvature of the mirror taken as origin.

(ii) The distances measured along the principal axis in the direction of incident light are positive.

(iii) The distances above the principal axis are taken positive.

1. (i)
2. (ii)
3. (iii)
4. both (i) and (ii)

The image formed by a convex mirror is:

1. erect and diminished
2. erect and enlarged
3. inverted and diminished
4. inverted and enlarged

For a spherical mirror, the focal length is …………… its radius of curvature.

1. equal to
2. half of
3. twice of
4. one-third of

For a concave mirror, when the object is at focus, the size of the image formed is:

1. magnified
2. highly magnified
3. diminished
4. of the same size