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Two identical symmetric double convex lenses of focal length f are cut into two equal parts L 1 , L 2 by AB plane and L 3 , L 4 by XY plane as shown in figure respectively. The ratio of focal lengt hs of lenses L 1 and L 3 is

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

Correct answer: 1 : 2

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