How Do Photons Behave When They Intersect?

[Passionate Eng]

Light can act like a wave or a particle ,depending on why?
when two photons intersect they must collide since they are particles
but rays independence tells they won't

 

[DrClaude]

when two photons intersect they must collide since they are particles

Why?

We already have a very similar thread, so I will close this one and invite you to read to other one and post in it if you have further questions:

https://www.physicsforums.com/threads/why-waves-of-light-dont-hit-each-other.860599/