Dear reader, I have written a paper which I require a reference for converging wave interference generating a caustic. When studying for my degree, I performed Young's double slit experiment with the addiction of a converging lens. I was trying to comprehend Afshar's conclusion/interpretation of the copenhagen agreement. When I placed the converging lens at one focal length from the illuminated double slit, the converging wave interference generated a caustic which beamed an image of the double slit to infinity. Stunned and amazed by this property of nature, I informed my professor. He quickly referred to Fresnel's equations as the explanation and that this was a well understood phenomena. My paper is base on this property of nature yet I can not find any reference to, or any indication that the physics community is currently aware of this phenomena. Please help. Thank you for any time and effort spent, Darrell.