I was under the impression that only wave theory of light was able to explain the ideas of diffraction and interference, until I encountered this video: https://m.youtube.com/watch?t=6s&v=Xdlr6yJLyaE .
Now owing to the above video which has left me quite puzzled. Is the the fact true that one can explain diffraction and interference through the photonic theory of light coupled with a very thin layer of fluid coating all interfaces between states of matter?
The explanation in the video gives a very pleasing answer to why light bends around my finger the way it does, and why it changes if I hold my finger near a heat source and also why it changes when I bring other fingers close to it without touching it, or forming a slit like setup.
Edit: https://www.natureoflight-particleonly.com/properties-of-fluid-layer link to his description of the fluid.