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# An object is located 6.0 cm from a plane mirror. If the plane mirror is replaced with a concave mirror, the resulting image is 8.0 cm farther behind the mirror. Assuming that the object is located between the focal point and the concave mirror, what is the focal length of the concave mirror?

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Plane mirror that is $d_o=6\,\,\rm{cm}$ away from the object is substituted with a concave mirror. This causes the image to be $\delta_i=8\,\,\rm{cm}$ farther behind the mirror. We need to determine the focal length of the mirror if an object is between mirror and the focal point.

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