A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where will the image be formed?
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 is the focal length (12.5 cm), u is the object distance (-10 cm), and v is the image distance. Solving gives v = -50 cm, indicating the image is 50 cm in front of the lens.

A Thin Lens of Focal Length 12