How do you verify experimentallybthat the focal length of a convex lens is increased when it is kept in water???

How do you verify experimentallybthat the focal length of a convex len

1.	How do you verify experimentallybthat the focal length of a convex lens is increased when it is kept in water???
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.hope this helps u if yes then mark me brainest answer plz

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How do you verify experimentallybthat the focal length of a convex lens is increased when it is kept in water???​

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How do you verify experimentallybthat the focal length of a convex lens is increased when it is kept in water???