Question

2. How do you verify experimentally that the focal length of a convex lens is increased when it is
kept in water? (AS)​

Answer 1

Answer:

Since from lens makers formula we can observe that focal length of lens is inversely proportional to refractive index of medium of lens . Hence net refractive index of lens decreases when it is dipped in a denser medium than air, hence focal length increases.(denser medium than air is water)

Explanation:

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Answer 2

Answer:

when the lense is immeresed in water the refractive index of the lense reduce the ray of light.