How is observer defined in context to quantum physics?does it have

[nouveau_riche]

Yep! :)

Any light source that makes it observable through which slit an electron goes, destroys the interference pattern (for all observers).

but there's another experiment i got which i think could give real weirdness...\

"consider the same interference experiment,the interference pattern produced is used to illuminate the next source in series,which then produces a new interference pattern,this gets cascaded say 10 times and the final interference pattern is obtained on the wall.
now ,the observer, observing the final interference pattern is not known of the fact that there's another observer measuring the particle position in the first stage of interference,and viceversa

"will ur answer b the same(no interference pattern) or something else?
and if u think that the experiment is not possible,state the reason along

 

[I like Serena]

but there's another experiment i got which i think could give real weirdness...\

"consider the same interference experiment,the interference pattern produced is used to illuminate the next source in series,which then produces a new interference pattern,this gets cascaded say 10 times and the final interference pattern is obtained on the wall.
now ,the observer, observing the final interference pattern is not known of the fact that there's another observer measuring the particle position in the first stage of interference,and viceversa

"will ur answer b the same(no interference pattern) or something else?
and if u think that the experiment is not possible,state the reason along

This experiment can be done just fine, although you seem to be mixing electrons with photons.
But that's not really a problem, it doesn't really matter which of them you use.

Cascading through a number of interference patterns will reduce the chance that a photon/electron will reveal which slit an electron/photon goes through.
I believe that the result will be a mixture of an interference pattern and a destroyed interference pattern (for all observers).

 

[nouveau_riche]

This experiment can be done just fine, although you seem to be mixing electrons with photons.
But that's not really a problem, it doesn't really matter which of them you use.

Cascading through a number of interference patterns will reduce the chance that a photon/electron will reveal which slit an electron/photon goes through.
I believe that the result will be a mixture of an interference pattern and a destroyed interference pattern (for all observers).

i think the result will still b the same as it was with previous experiment