A biconcave lens of power \( P \) vertically splits into two identical plano concave parts. The ...

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A biconcave lens of power \( P \) vertically splits into two identical plano concave parts. The power of each part will be :
(A) \( 2 P \)
(B) \( \frac{\mathrm{P}}{2} \)
(C) \( \mathbf{P} \)
(D) \( \frac{P}{\sqrt{2}} \)
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