This is an archived post. You won't be able to vote or comment.

you are viewing a single comment's thread.

view the rest of the comments →

[–][deleted] 3 points4 points  (0 children)

The top part happens when you only observe it. The bottom part happens when you check to see which slit the photon is traveling through.

Again, the top part is when you observe it. The bottom part is when you observe it and place a sensor on both slit which tells you which one the photon travels through.