$A$ lens of power $3.5 \, D$ is placed in contact with a lens of power $-2.5 \, D$. The combination behaves as:
- A$A$ converging lens of focal length $100 \, cm$
- B$A$ diverging lens of focal length $100 \, cm$
- C$A$ converging lens of focal length $200 \, cm$
- D$A$ diverging lens of focal length $200 \, cm$
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