A coin of diameter D C is 300 cm in front of a parallel wall on which
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A coin of diameter DC is 300 cm in front of a parallel wall on which is hung a circular flat mirror of diameter DM. A person stands 900 cm from the wall. Show that DM = 3/4 DC is the smallest-diameter mirror in which the observer can just see the reflected edge of the coin (i.e., the image of the coin just fills the mirror).
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