An object is placed a distance yo = –2f in front of a convex lens of focal length fthat is located at y = 0. An identical object is placed a distance yo = -2f in front of a concave lens of focal length -f that is located at y' = 0. The difference between the two image positions, y; -y, is а. b. f. с. 4 d. 2f. е. 8
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