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Tan's Face Is 20 Cm in Front of a Concave

Question 165

Multiple Choice

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

Correct Answer:

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