COMMUNICATIONS FACULTY OF SCIENCES UNIVERSITY OF ANKARA-SERIES A1 MATHEMATICS AND STATISTICS, cilt.65, sa.2, ss.55-64, 2016 (ESCI)
In this paper, we investigate the focal surfaces obtained by the timelike normal rectilinear congruence whose straight lines are normal to space like surface, in the Minkowski 3-Space. Then, the relation lambda(1) K(Z)1 + lambda(2)K(Z)2 = 0 between Gaussian curvatures of these focal surfaces are examined and finally the relation which concern with area preserving correspondence between the focal surfaces are given.