A convex lens of refractive index \( 1.5 \) has focal length \( 20 ...

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A convex lens of refractive index \( 1.5 \) has focal length \( 20 \mathrm{~cm} \) in air. When this lens is immersed in water (refractive index \( =4 / 3 \) ), the new focal length (in \( \mathrm{cm} \) ) is
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