TEST ON CONCAVE AND CONVEX MIRRORS

1. Define (a) a real image (b) a virtual image (c) magnification.

2. Draw a diagram showing how the image is formed in a concave mirror if the object is
(a)  between the centre of curvature and the focus
(b)  between the focus and the pole.

3. Give two uses each for (a) a concave (b) a convex mirror.

4. Say how you would find the approximate focal length of a concave mirror using only a concave mirror, a metre stick and a sheet of paper.

5. A concave mirror has a focal length of 25 cm. An object is placed 40 cm from the mirror.
Find the position of the image formed.
State the nature and the magnification of the image.

6. A convex mirror has a focal length of 15 cm. An object is placed 5 cm in front of the mirror.
Find the position of the image formed.
State the nature of the image.

7. In an experiment to find the focal length of a concave mirror the following values were obtained.

u/m	0.24	0.26	0.28	0.30	0.32	0.34
v/m	1.2	0.867	0.70	0.60	0.533	0.486

(a) Draw a labelled diagram of the apparatus used.

(b) Use a suitable graph to find a value for the focal length of the concave mirror, f.