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1)When we try to observe which slit the electron is going through, how exactly do we go about making the measurement? what kind of "device" or "technique" do we use?

and

2) If suppose we were to observe only 1 slit instead of the two, then what would happen? Cause if we observe only one slit then we will know which slit exactly the electron is going through, (cause if we don't detect it in the slit we observe, then its naturally going in through the other one) Then since we do not directly "observe" the second slit, what happens then? do we get an intereferance pattern? or what exactly do we get?

Thx...