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If you shine a light on the electrons as they pass through the double-slit to find out which of the paths they took, there's no interference pattern, just two piles.

That's the Feynman double-slit.

Now...

What happens if, after you shine the light, you force them through ANOTHER double-slit?

Does the distance between the 1st double-slit and 2nd double-slit matter?