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A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distance x 1 and x 2 (x 1 > x 2 ) from the lens. The ratio of x 1 and x 2 is :

1. 4 : 3
2. 3 : 1
3. 2 : 1
4. 5 : 3

Correct answer: 3 : 1

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