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A procedure for the measurement of focal length and radius of curvature of a lens using coherent gradient sensing system and Fourier transform fringe analysis technique has been demonstrated. Light from the laser illuminates the specimen and the wavefront emerging from the specimen is tested using coherent gradient sensing interferometer. Beats Solo The fringe pattern corresponding to the test wavefront is stored, and analyzed using Fourier fringe analysis technique. The slope of the wavefront in the direction of shear has been evaluated. It provides the information regarding exact location Hp Beats Audio Laptop Canada of points corresponding to the focus/center of curvature of the lens. High accuracy and precision has been achieved. A method is proposed for the solution of the continuum elastic-plastic problems by means of the finite element approach. The method is based on a plastic stress-strain matrix which is derivable by inverting the Prandtl-Reuss equations in plasticity theory. The matrix is of quite simple form and facilitates the incremental treatment of elastic-plastic problems. The present approach follows the indication of Marcal and King's work, but uses the small and varying increments of load sufficient to just cause yield in the successive elements, the continuum being divided into triangular elements. As examples of solutions notched tension specimens under conditions of plane stress are studied.