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A 1.6-m-tall girl stands 3.2 m from a convex mirror. What is the focal length of the mirror if her image appears to be 0.28 m tall?

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In this problem, we have a convex mirror, where we need to find the focal length of the mirror. To solve this, we are going to use the mirror equation 1f=1do+1di\frac{1}{f} = \frac{1}{d_{o}}+ \frac{1}{d_{i}} where ff is the focal length of mirror, dod_{o} is the position of our object, and did_{i} is the position of image. Also, we are going to use the magnification equation to find the image height M=dido=hihoM= -\frac{d_{i}}{d_{o}}= \frac{h_{i}}{h_{o}}

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