A system matrice consists of two submatrices S1 & S2. This is the sequence of submatrices in the direction of light propagation. The element of the matrices S1 are: s11=0.6150; s12=-0.7325; s21=0.11;s22=1.495. The elements of the matrice S2 are: s11=-0.08; s12=-6.16; s21=0.18;s22=1.36. What is the equivalent optical power Pe?