Begin with Maxwell Equation>>Aim at the trajectory (VS)2=n2 n=√EL Foundmental Equation of Geometrical Optics e·VS=0 VS×e-Mh=0/ⅤSVS vsd h VS=0 VS VS OC VS×h+Ee=0 as2 2 ( )  = S n n =  0 0 0 0 e S S e h h S S h e     =    − =    =     + = S S n   S S s n S   = =  d r n S ds = 