Focal length of a convex lens of refractive index \( 1.5 \) is \( 2...

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Focal length of a convex lens of refractive index \( 1.5 \) is \( 2 \mathrm{~cm} \). Focal length of lens when immersed in a liquid of refractive index \( 1.25 \) will be
\( \mathrm{P} \)
(A) \( 5 \mathrm{~cm} \)
(B) \( 7.5 \mathrm{~cm} \)
W
(C) \( 10 \mathrm{~cm} \)
(D) \( 2.5 \mathrm{~cm} \)
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