A Cell Phone That Is 8

Multiple Choice

A cell phone that is 8.90 cm tall is placed in front of a convex mirror.The image of the phone is 7.80 cm tall and is located 14.8 cm from a mirror.What is the mirror's focal length?

A) -120 cm
B) -105 cm
C) +16.9 cm
D) -13.0 cm
E) +120 cm