Choose the one alternative that best completes the statement or answers the question. -Tan’s face is 20 cm in front of a concave shaving mirror. If he observes his image to

Choose the one alternative that best completes the statement or answers the question.
-Tan’s face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?
A) 40 cm
B) 10 cm
C) -50 cm
D) 50 cm
E) -40 cm

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