?An object is placed a distance y0=?2f in front of a concave mirror of focal length f that is located at y = 0. An identical object is placed a distance ?y'0 = ?2f in front of a convex mirror of focal length?f that is located at y' = 0. The difference between the two image positions, yi ? y'i, is
A. ?f /2.
B. ?f.
C. ?4f /3.
D. ?2f.
E. ?8?f? /3.
Answer: E
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