TEST PLATE - AN EXACT SOLUTION

The Newton interferometer is a very useful instrument for testing opti cal surfaces its use, however, require the use of a test plate, and fo r this we must design properly the curvatures and thickness of the tes t plate. So far, the equations for performing radii of curvature calcu lations have been restricted to the paraxial approximation. In this wo rk we establish the exact solution for such equation, and compare our results with those obtained from the paraxial theory.