A double convex lens of focal length \( 20 \mathrm{~cm} \) is made ...

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A double convex lens of focal length \( 20 \mathrm{~cm} \) is made of glass of refractive index \( 3 / 2 \). When placed completely in water \( \left({ }_{a} \mu_{\square}=4 / 3\right) \), its focal length will be
\( \mathrm{P} \)
(A) \( 80 \mathrm{~cm} \)
(B) \( 15 \mathrm{~cm} \)
W
(C) \( 17.7 \mathrm{~cm} \)
(D) \( 22.5 \mathrm{~cm} \)
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