Question: A very thin sheet of plastic (n = 1.60) covers one slit of a double-slit apparatus illuminated by 640-nm light. The center point on the

A very thin sheet of plastic (n = 1.60) covers one slit of a double-slit apparatus illuminated by 640-nm light. The center point on the screen, instead of being a maximum, is dark. What is the (minimum) thickness of the plastic?

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