Particle or wave forms of light are different models used to solve the physics in differnet situations. Generally, when concerned about the interfernece of light, at least before 3rd year university level, you can associated the wave concept with light, but the similar results can be getting with the particle theory, in which case all the path of the particles are summed up in a path integral formulation developed by richard feymann.
Two models of light give the exactly the similar results in mathematics, only that one describes the physics in words better than the other in some specific situations.