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A convex lens has f = 12 cm and an object is 18 cm away. The magnification is:
A-2
B+2
C-0.5
D-3
Answer & Solution
Correct answer: A. -2
1/v = 1/12 - 1/18 = 1/36 gives v = 36 cm, so m = v/u = 36/(-18) = -2, a real inverted image.
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