A 4-cm object is placed in front of a converging lens of focal length 20 cm. The image is formed 60 cm on the other side of the lens. Which entry in the table below is correct?

Question

Quizplus · Accepted Answer

We can use the thin lens equation to find the image distance:

1/f = 1/do + 1/di

Where f is the focal length of the lens, do is the object distance (4 cm in this case), and di is the image distance (60 cm in this case).

Plugging in the values, we get:

1/20 = 1/4 + 1/di

Solving for di, we get:

di = 80 cm

So the image is actually 80 cm on the other side of the lens.

Looking at the table, we can see that choice D is the only one with an image distance of 80 cm, so the answer is:

Answer: D

A 4-Cm Object Is Placed in Front of a Converging