Choose the one alternative that best completes the statement or answers the question. -When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in

Choose the one alternative that best completes the statement or answers the question.
-When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?
A) -0.25 cm
B) -1.3 cm
C) 2.4 cm
D) 15 cm
E) 4.0 cm

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