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

The type of mirror used as a reflector in the street lights is :

1. plane mirror
2. convex mirror
3. concave mirror
4. parabolic mirror

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)

A real and enlarged image can be obtained by using a:

1. convex mirror
2. plane mirror
3. concave mirror
4. either convex or plane mirror