Sally places an object 8.0 cm from a thin convex lens along its axis.The lens has a focal length of 19.0 cm.What are the respective values of the image distance and magnification?

Question

Quizplus · Accepted Answer

Using the thin lens equation, 1/f = 1/do + 1/di where f is the focal length, do is the object distance, and di is the image distance, we can solve for di:
1/19.0 = 1/8.0 + 1/di
di = -13.8 cm (negative sign indicates the image is formed on the opposite side of the lens from the object)

To find the magnification, we use the equation m = -di/do:
m = -(-13.8)/8.0
m = 1.7 (positive sign indicates the image is upright)

Therefore, the answer is A) -13.8 cm and + 1.7.

Sally Places an Object 8