A lamp which is 11.5 cm tall is in front of a concave mirror which has a focal length of 66.0 cm.
(a) How tall is the lamp's image if the lamp is a distance of 39.6 cm from the mirror (include sign if negative)?
(b) How tall is the lamp's image if the lamp is a distance of 85.8 cm from mirror (include sign if negative)?
(c) How tall is the lamp's image if the lamp is a distance of 145.2 cm from the mirror?