How far must a girl stand in front of a concave spherical mirror of radius 120 cm to see an erect image of her face, four Physics - Questions and Answers

How far must a girl stand in front of a concave spherical mirror of radius 120 cm to see an erect image of her face, four times its natural size?

(a)40 cm from the mirror

(b)45 cm from the mirror Right sign

(d)55 cm from the mirror

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