Draw a labelled ray diagram for the image formation by a concave mirror when an object is placed between its centre of curvature and focus.

When an object is placed between the centre of curvature (C) and the focus (F) of a concave mirror, the image formed has the following characteristics:
- The image is formed beyond the centre of curvature (C).
- The image is real and inverted.
- The image is magnified (larger than the object)
Find the magnification of the image formed by a spherical mirror from the following data :
$u = -20$ cm, $f = -15$ cm.
