Where Do Optics and Photonics Fit in the Classification of Physics?

[ShayanJ]

In classification of the physics section of this site,there is nothing explicitly containing Optics or Photonics.Which part of physics do they belong to?
Also why Atomic,solid state and computational physics are in one part?
Thanks

 

[Simon Bridge]

eg. Optics spans classical and modern physics ... ray optics would be classical for example. So you pick the forum according to where the particular question lies.