SPHERICAL-ABERRATION AND ITS CORRECTION USING LIE ALGEBRAIC METHODS

We discuss three methods to correct spherical aberration for a point t o point imaging system. First, results obtained using Fermat's princip le and the ray tracing method are described briefly. Next, we obtain s olutions using Lie algebraic techniques. Even though one cannot always obtain analytical results using this method, it is often more powerfu l than the first method. The result obtained with this approach is com pared and found to agree with the exact result of the first method.