Instruction: Input numerical values only; no unit. Keep two decimal points for your numerical
answer. Example: -3.14, -314.51, 3.14, 314.51
A real object is 9 cm tall. The object is placed on the left side of a converging lens with a focal
length of 8 cm. The object forms an upright image by the lens. If the image is 20 cm away from the
lens, what is the height of the image (unit in cm)? Express the answer as a positive quantity.