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0. The refractive index of glass with respect to air is 1.53 and that of water with respect to air is 1.33. Then a convex lens whose focal length in air is 20 cm, when fully immersed in water would have the focal length (NTSE Odisha, Stage-I, 2014-15)
20 cm
3.9 cm
70.49 cm
7.8 cm
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