A thin convex lens of refractive index 1...

A thin convex lens of refractive index 1.5cm has 20cm focal length in air. If the lens in completely immersed in a liquid of refractive index. 1.6, then its focal length will be

is less than 1

is greater than 2

lies between `sqrt(2)` and 1

lies between 2 and `sqrt(2)`

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