Particles of light, known as photons, do not interact with each other in the same way that macroscopic particles do. Photons, as elementary particles, are considered to be massless and have no electric charge. As a result, they do not experience the electromagnetic forces that would cause them to directly interact or bounce off each other.
However, in certain circumstances, photons can indirectly interact or exhibit collective behavior. For example, in quantum electrodynamics, which is the quantum field theory describing the interactions of photons and electrons, there are higher-order processes where photons can interact via the exchange of virtual particles. These interactions occur through intermediary particles such as virtual electrons or other charged particles.
Furthermore, in certain materials or media, photons can undergo scattering, which is the process of changing their direction due to interactions with the material's constituents. This scattering can occur through various mechanisms, such as Rayleigh scattering or Raman scattering, where the photons interact with atoms or molecules in the material. However, this scattering does not involve direct photon-to-photon interactions but rather interactions with the material's particles.
In summary, while photons do not directly bounce off each other like macroscopic particles, they can exhibit collective behavior through higher-order processes and can interact with the constituents of materials, resulting in scattering phenomena.