[Alan McDougall (OP)]

When a photon is emitted from source A and reaches destination B we know the photon exists because we see the after effect from it making impact with source B.

But my question is "does that photon actually exist in the space between source A and destination B?"

Alan

[PmbPhy]

Does  photon actually exist in the space between source A and destination B?

The answer to that question is yes. But we cannot say anything about it than it exists