A 6 centimeters object is 15 centimeters from a convex lens that has a focal length of 5 centimeters What is the distance of the image from the lens, to the nearest hundredth?

Use the thin-lens equation: 1/f = 1/do + 1/di. Substituting f = 5 cm and do = 15 cm gives 1/di = 1/5 − 1/15 = 2/15, so di = 7.50 cm. The image is 7.50 centimeters from the lens, which is choice C.

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