How do you verify experimentally that the focal length of a convex lens is increased when it iskept in water?
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In this question,
i) Take a cylindrical glass tumbler whose height is much greater than the focal length of the lens and fill it with water.
ii) Keep a black stone at the bottom of the vessel.
iii) Now dip the lens into the water using a circular lens holder such that it is at a distance which is less than or equal to the focal length of the lens in air.
iv) Now see through the lens to have a view of the black stone.
v) Now increase the height of the lens until you are not able to see the stone’s image.
vi) When the lens is dipped to a height which is greater than the focal length of the lens in air, we are able to see the image. Showing that focal length of the lens has increased water.
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