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16. An object is 10 m to the left of a concave mirror. (a) What is the focal length of the mirror if the image is formed on the left side of the mirror, 15 m from the mirror? (4 points) (b) Find the magnification and determine if the image is upright or inverted (2 points). Is the image real or virtual? (2 points) (c) The object is moved, so that the object and the image are on the same sides of the mirror with equal distance from the mirror. What is the object distance from the mirror? (4 points) if the object is moved closer to the mirror, determine mathematically (show your work) the location at which the image will start to appear on the opposite side of the mirror. (4 points) (d)