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To obtain the focal length of a convex lens an object is put on the pricipal...

To obtain the focal length of a convex lens an object is put on the pricipal axis of the lens.Another side of the lens a screen is kept.Distance between the screen and object is fixed i.e. 80 cm.Position of convex lens is changed.It is found that for two different position of convex lens image is formed on the screen.These position are separated by a distance 20 cm,then the focal length of the lens is.....

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