A concave mirror of focal length \(100\) cm is used to obtain the image of the sun which subtends an angle of $\mathrm{}$\(30'.\) The diameter of the image of the sun will be:
1. \(1.74\) cm
2. \(0.87\) cm$$
3. \(0.435\) cm$$
4. \(100\) cm

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

1.		2.
3.		4.

As the position of an object \((u)\) reflected from a concave mirror is varied, the position of the image \((v)\) also varies. By letting the \(u\) change from \(0\) to infinity, the graph between \(v\) versus \(u\) will be:

1.		2.
3.		4.

For a concave mirror, if the virtual image is formed, the graph between m and u is of the form :

1.		2.
3.		4.