Choose the one alternative that best completes the statement or answers the question. -A person’s face is 30 cm in front of a concave spherical shaving mirror. If the image is

Choose the one alternative that best completes the statement or answers the question.
-A person’s face is 30 cm in front of a concave spherical shaving mirror. If the image is an erect image that is 1.5 times as large as the object, what is the focal length mirror?
A) 20 cm
B) 90 cm
C) 70 cm
D) 50 cm

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