For thin lens, when image distance equals object distance (|v| = |u|), object position is:
AAt 2f (object and image both at 2f)
BAt f
CHalf of f
DAt infinity
Answer & Solution
Correct answer: A. At 2f (object and image both at 2f)
For convex lens, |v| = |u| occurs at u = 2f. Then v = 2f, m = -1 (same size, inverted, real). Useful for image relay systems.
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