An image is 4.0 cm behind a concave mirror with focal length 5.0 cm. Where is the object?
A) 2.2 cm in front of the mirror
B) 2.2 cm behind the mirror
C) 9.0 cm in front of the mirror
D) 1.0 cm behind the mirror
E) 20 cm behind the mirror

Question

Quizplus · Accepted Answer

The image is virtual and upright, so the object must be between the pole and the focal point. Using the thin lens equation, 1/f = 1/do + 1/di, we get do = 2.2 cm.

An Image Is 4