Young’S Modulus OF A Metal ROD

The experimental rod carries 2 metal plates at different points. These metal plates support a glass plate and a lens. One is on the top of other adjusted by 3 springs and screws. On applying a load the rods bend slightly, increasing the distance between the plate and the lens. Newton’s rings are observed before applying the load. As the load is applied gradually the rings run into the centre, disappearing one at a time.