A concave mirror of focal length $100$ cm is used to obtain the image of the sun which subtends an angle of $30'.$ 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.