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A lens is placed between a source of light and a wall. It forms images of area 1 A and 2 A on the wall for its two different positions. The area of the source or light is

1. 2 2 1 A A 
2. 1 2 1 1 1         A A
3. 2 1 A A
4. 2 2 1 2          A A

Correct answer: 2 1 A A

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