Posted by Anonymous on Monday, March 8, 2010 at 5:44pm.
Since it is convex, the focal length is negative. From the magnification,you know that the image distance is Di = -0.65 Do. The image distance Di is negative because it is a virtual image, behind the mirror.
Now solve
1/Do + 1/Di = 1/Do -1/0.65 Do = 1/f
(1 - 1.538)/Do = 1/f
-0.538/Do = 1/f
f = -1.86 Do = -5.2 m
Thank you!
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