A dental hygienist uses small concave mirror to look at the back of a patient's tooth. If the mirror is 1.28 cm from the tooth and the magnification is 2.35, what is the mirror's focal length? (Include the sign of the value in your answer.) cm
A dental hygienist uses small concave mirror to look at the back of a patient's tooth. If the mirror is 1.28 cm from the tooth and the magnification is 2.35, what is the mirror's focal length? (Include the sign of the value in your answer.) cm
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