Define the centre of curvature for a convex mirror.

The image of an extended object, placed perpendicular to the principal axis of a mirror, will be erect if:
$(a)$ The object is real and the image is real.
$(b)$ The object is virtual and the image is virtual.
$(c)$ The object is real and the image is virtual.
$(d)$ The object is virtual and the image is real.

In an experiment to find the focal length of a concave mirror,a graph is drawn between the magnitudes of $u$ and $v$. The graph looks like:

What is the maximum distance at which an image can be formed by a convex mirror of focal length $10 \ cm$?

When an object is placed $40\ cm$ away from a spherical mirror,an image of magnification $\frac{1}{2}$ is produced. To obtain an image with magnification of $\frac{1}{3}$,the object is to be moved $:$

An object $O$ is placed at $7 \,cm$ to the left of a concave mirror of radius of curvature $12 \,cm$ as shown in the figure. The position of the image will be at a distance of