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OpenStudy (anonymous):
a person's face is 30 cm in front of a concave shaving mirror. if the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
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OpenStudy (anonymous):
\[1/f = 1/s _{0} + 1/s _{1}\] \[M = s _{1}/ s _{0}\]
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