Question

Given the focal length of a lens in air its focal length in water is

Answer 1

focal length of converging glass lens in water. A converging glass lens (n = 1.52) has a focal length of 40 cm in air. Find its focal length when it is immersed in water, which has an index of refraction: nw = 1.33.

Answer 2

focal length of converging glass in water. A converging glass lens 1.52 has a focal lenth of 40 cm in air.
Its focal length in water which has index of reflection: 1.33

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