“…In (1 8), making c =0, then p = oo, this kind of array is plane array, from (1 8) we know that plane array will get pseudo-conjugation well with a = 1, b 0, c =0, d -1. it contents only two factors, by paraxial theory this two kinds of arrays have same compensative ability, but our theory, as well as experiments{6] [9] proves that the former array has more compensative ability than the later.…”