Thin Lenses: A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A. -6.0 cm
B. -7.5 cm
C. -13 cm
D. +18 cm
E. +6.0 cm
Answer: C
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