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A thin equiconvex lens of power P is cut into three parts A, B, and C as shown in the figure. If P1, P2, and P3 are powers of the three parts respectively, then
1. P1 = P2 = P3
2. P1 > P2 = P3
3. P1 < P2 = P3
4. P2 = P3 = 2P1