Question

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Reflections on concepts
How do you verify experimentally that the focal length of a convez lens is
increased when it is kept in water? (AS)
How do you find the focal length of a les experimentally? (AS)
Drew ray diagrams for the following positions and explain the nature and position
of image
i Object is placed at C2
ii. Object is placed between F2 and optic centre P. (AS)
caso in ISC 2020-21​

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.