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)50 cm
C)70 cm
D)90 cm

Question

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The Answer of 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)50 cm
C)70 cm
D)90 cm

A Person's Face Is 30 Cm in Front of a Concave