Question

When does light travels as wave and when as particle?

Answer 1

Well, it isn't that simple. Light exists as both, wave and particle quantum states simultaneously (weird, but quantum physics is weird!).

But is seems* like light behaves waves when it propagates, and like a particle when it interacts with matter.

To give an analogy, it's like you threw a stone in water, the waves traveled in all directions, but hit the shore at one point (again, weird af!)

I don't really know about how much you already know, but I hope you know have a little idea about quantum physics (atleast heard that it's strange) to make sense of this.

Answer 2

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• Light Is Also a Particle! Now that the dual nature of light as "both a particle and a wave" has been proved, its essential theory was further evolved from electromagnetics into quantum mechanics. Einstein believed light is a particle (photon) and the flow of photons is a wave.