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Suppose that only slit 1 is uncovered, and all other slits 2—10 are covered. Which other slit could be uncovered so that the screen would be completely dark at point X? Explain.
Suppose that this pair of slits is uncovered, so that point X is completely dark. If slit 2 were now uncovered, would point X remain completely dark? If not, which other slit could also be uncovered (to pair with slit 2) so that point X once again becomes completely dark? Explain.
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