Choose the one alternative that best completes the statement or answers the question. -A seed is 15 mm in front of a converging lens, and the image of the seed is

Choose the one alternative that best completes the statement or answers the question.
-A seed is 15 mm in front of a converging lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?
A) 11 mm
B) 3.2 mm
C) 3.8 mm
D) 5.5 mm

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