SAT Subject Physics Practice Question 187: Answer and Explanation
33. An object is placed 20 cm from a diverging lens. If the distance between the lens and the image is 8 cm, what is the magnification?
Correct Answer: B
Apart from sign, the magnification factor, m, is equal to i/o, where i is the image distance from the lens and o is the object distance. In this case then, we have m = i/o = (8 cm)/(20 cm) = 2/5.