Focal length of a convex lens of refractive index 1.5 is \( 2 \mathrm{~cm} \). Focal length of l...

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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
\( \mathrm{P} \)
liquid of refractive index of 1.25 will be
W
(1) \( 10 \mathrm{~cm} \)
(2) \( 7.5 \mathrm{~cm} \)
(3) \( 5 \mathrm{~cm} \)
(4) \( 2.5 \mathrm{~cm} \)
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