Doubt in Wheeler's delayed choice experiment

[ashok vardhan]

Sir, I've gone through wheeler's delayed choice experiment recently...i've got few couple of doubts in it..Please clarify them...Actually Wheeler wanted an answer for his questionthat



"what happens when a single photon, presumably already determined to get detected as part of a two-slit interference pattern, suddenly gets detected in a path coming from only one slit. Does the interference pattern then disappear?"

what answer did he get..?? and my doubt is that when we place detection screen we'll see interference pattern and if remove the screen and detect the light from slits through a telescope we 'll know by which slit has the photon come...right...?..what is the inference this observation gives..??it can behave either as wave or particle..right..?? or something else...correct me...if iam wrong antwherein my arguements..Thanking You Sir...

With Regards

Ashok.

 

[azntoon]

Wheeler's answer to his question was that the photon's behavior is indeterminate until it is actually measured. This means that the photon can behave either as a wave or a particle, depending on whether or not it is being observed. This has been experimentally verified in numerous delayed choice experiments, where a photon's behavior changes depending on whether or not a detection screen is in place. The inference that can be drawn from this observation is that the behavior of particles is not determined until it is observed, and that the act of observation itself affects the behavior of the particle.