Two thin lenses with 10.0-cm focal lengths at are mounted at opposite ends of a 30.0-cm long tube.An object is located 45.0 cm from one end of the tube.How far from the opposite end is the final image?

Question

Quizplus · Accepted Answer

Using the thin lens equation, 1/f = 1/di + 1/do, where f is the focal length, di is the image distance, and do is the object distance, we can solve for the image distance of the first lens:
1/10 = 1/di + 1/45
di = 28.1 cm
This image distance becomes the object distance for the second lens. Using the same equation, we can solve for the final image distance:
1/10 = 1/di + 1/28.1
di = 24.0 cm, which is the distance from the opposite end of the tube. Therefore, the correct answer is B) 24.0 cm.

Two Thin Lenses with 10