How far must a man's face be located in front of a concave spherical shaving mirror of radius 120 cm for him to see an erect image of his face four times its real size?
A)-75 cm
B)45 cm
C)75 cm
D)90 cm
E)150 cm

Question

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The Answer of How far must a man's face be located in front of a concave spherical shaving mirror of radius 120 cm for him to see an erect image of his face four times its real size?
A)-75 cm
B)45 cm
C)75 cm
D)90 cm
E)150 cm

How Far Must a Man's Face Be Located in Front