Question

Jill puts her face in front of a convex mirror, 18 cm from the focal point of the mirror. If the focal point is located 12 cm from the mirror, where will her image appear?

Answer 1

Object distance is \[d_{o}=\]6cm

Focal length = -12 cm (for convex mirrors)

Image distance = \[d_{i}=\] cm

Apply the equation

\[1/d_{o}+1/d_{i}=1/f\]

\[1/d_{i}=-1/12-1/6=-3/12=-1/4\]

\[d_{i}=-4 cm\]

The negative sign indicates that it is a virtual image on the other side of the mirror