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

Question

Quizplus · Accepted Answer

Using the mirror formula (1/f = 1/v + 1/u), where f is the focal length, v is the image distance, and u is the object distance, we find v = -25 cm, indicating the image is 25 cm behind the mirror.

A Mirror with a Focal Length 100 Cm Has a 4.0