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

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

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