In double slit experiments detection of individual electron has very massive effect on the result. Now suppose in dark room we perform double slit experiments with two observers (who cannot communicate with each other). Now those two observers have eyesight that can see individual electron in the path from source to destination.There is random chance associated with each individual electron say in which slit it will pass. According to Copenhagen interpretation if we do not observe from which slit electron will pass then we get interference pattern otherwise standard particle pattern. Now suppose both observers see each individual electron from the source up to point A.From point A electron can take any path from two slits. Now user 1 decided not to see electron’s path and direct see on detector screen and user 2 decides to see in which slit electron pass? What will user 1 see??Why??