(Solved): 1. Draw a concave mirror with its principal axis. 2. Mark the focal point ( F ) on the principal ax ...

1. Draw a concave mirror with its principal axis. 2. Mark the focal point ( $F$ ) on the principal axis, to the left of the mirror. 3. Place the object (an arrow, for instance) to the left of the mirror, $28\mathrm{cm}$ away. 4. Draw two incident rays: one parallel to the principal axis, then reflected through the focal point; and another through the focal point, then reflected parallel to the principal axis. 5. The point where these reflected rays intersect is the image location. For magnification $(m)$, you can use the formula: $m=-\frac{d_i}{d_o}$ Now, you can substitute the calculated $d_i$ into the magnification formula to find the magnification.