Thin Lenses: A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?
A. 6.8 cm
B. -30 cm
C. 16 cm
D. 30 cm
E. -16 cm
Answer: D
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