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In a concave mirror experiment, an object is placed at a distance 1 x from the focus and the image is formed at a distance 2 x from the focus. The focal length of the mirror would be

1. 2 1 x x
2. 2 1 x x
3. 2 2 1 x x 
4. 2 1 x x

Correct answer: 2 1 x x

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