As you have already pointed out; if a radiant source is placed at one focal length from a converging lens, parallel waves are the result. If this is true, how do these waves interfere? Also, the diverging interference pattern results from diverging waves yet the converging interference pattern...
Please recall "stunned and amazed" I did expect the light to exit the lens parallel and what's more important is the obvious change of direction at the caustic. The diagram depicts what I observed. I have performed this experiment many times to astonish others. It is as if interfered waves...
Thanks for your quick reply, however I was referring to the phenomena of converging interfered waves forming an image at the caustic, which then "beams" to infinity. The reference you provide does not cover this phenomena. Please check link provided for a diagram.
http://i.imgur.com/mXAGsrr.png
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...