The figure shows a thin lens with point \( C_{1} \) and \( C_{2} \) at the centres of curvature....

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The figure shows a thin lens with point \( C_{1} \) and \( C_{2} \) at the centres of curvature.

The focal length of lens will be (refractive index \( =1.5) \)
(A) \( 60 \mathrm{~cm} \)
(B) \( 45 \mathrm{~cm} \)
(C) \( 120 \mathrm{~cm} \)
(D) \( 75 \mathrm{~cm} \)
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