Explain how do you verify that focal length of a Convex lens is increased when it is kept in
water with a neat diagram.
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Explain how do you verify that focal length of a Convex lens is increased when it is kept in
water with a neat diagram.
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Step By Step Explanation:
Aim: To prove that the focal length of a convex lens is increased when it is kept in water.
Apparatus: Convex lens of known focal length, circular lens holder, tall cylindrical glass tumbler, black stone, water.
Procedure :
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 that is greater than the focal length of the lens in air, we can see the image. Showing that the focal length of the lens has increased water.
vii) From this, we conclude that the focal length of a convex lens is increased when it is kept in water.
sorry I couldn't upload the diagram
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