A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?
A)25 cm behind the mirror
B)20 cm behind the mirror
C)20 cm in front of the mirror
D)25 cm in front of the mirror
E)100 cm in front of the mirror

Question

Quizplus · Accepted Answer

Using the mirror equation (1/f = 1/do + 1/di), where f is the focal length (20 cm), do is the object distance (100 cm), and di is the image distance. Solving for di gives di = 25 cm in front of the mirror.

A Mirror with a Focal Length 20 Cm Has a 4.0