<p>The classical interpretation of Young’s double slit experiment is that, before and after passing through the diaphragm of the double slit, the light behaves as waves. Feynman called the double slit experiment “the only mystery [of quantum mechanics]. We propose for the first time both the photon chamber and Postulates of convex lens, and utilize both to the classical wave experiments. Experiments show new phenomena that, in the same experiments: (1) the non-interference patterns near the diaphragm and interference patterns near the screen coexist; (2) the non-interference patterns evolve to the interference patterns; (3) the interference patterns and the non-interference patterns are produced independently and partially; (4) the light is not EM waves. The light is photons not only in Photoelectric effect but also in the classical wave experiments, and the photons distribute as waves near and on the screen, we referred the phenomena as Photowaves. The experimental results in this article are consistent. New phenomena require an interpretation.</p>