An image is 4.0 mm in front of a converging lens with focal length of magnitude 5.0 mm. Where is the object for this image?
A) 20 mm in front of the lens
B) 2.2 mm behind the lens
C) 2.2 mm in front of the lens
D) 9.0 mm behind the lens

Question

Quizplus · Accepted Answer

Using the lens 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 can solve for u. Given f = 5 mm and v = -4 mm (since the image is in front of the lens), we find u = 2.2 mm in front of the lens.

An Image Is 4