Do photons collide with each other like any other physical object we encounter in daily experience?
The response to the question related to photons obeying the laws of classical mechanics is No, photons are quantum objects and because of that they are correctly described by the laws of quantum mechanics, or more precisely by the laws of QED (quantum electrodynamics) which is the most accurate theory the human has ever created and involves the study of the interactions of electromagnetic fields with matter fields. From the equations of classical electrodynamics (Maxwell’s equations) which are the non quantized description of electromagnetic fields, it is evident that they conform a set of linear partial differential equations and for this reason it is always possible to obtain from 2 different solutions a new one just by adding them. This property is called the superposition principle and is the reason of why electromagnetic waves don’t interact with each other (photons don’t collide), although this is half true. Indeed QED describes photons as entities which at low energies don’t int
