Choose the one alternative that best completes the statement or answers the question. -When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is

Choose the one alternative that best completes the statement or answers the question.
-When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is twice the size of the object. What is the focal length of the mirror?
A) 80 cm
B) 40 cm
C) 27 cm
D) 160 cm

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