A thin lens of focal length −12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where is the image located?
A) 2.5 cm behind the lens
B) 5.6 cm behind the lens
C) 5.6 cm in front of the lens
D) 50 cm behind the lens
E) 50 cm in front of the lens

Question

Quizplus · Accepted Answer

Using the lens formula 1/f = 1/v - 1/u, where f = -12.5 cm and u = -10 cm, we find v = -5.6 cm, indicating the image is 5.6 cm in front of the lens.

A Thin Lens of Focal Length −12