517591.fig.0019a
(a)
517591.fig.0019b
(b)
517591.fig.0019c
(c)
517591.fig.0019d
(d)
517591.fig.0019e
(e)
Figure 19: Fringes obtained due to interference between a vortex of charge 3 with (a) Spherical beam of positive curvature (b) spherical beam of negative curvature (c) conical beam. (d) Interference between an off centred vortex and a spherical wave (e) Interference between negatively charged vortex and a spherical beam with positive curvature.