In a double-slit experiment the slit spacing is 022m the, Ask an Expert

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In a double-slit experiment, the slit spacing is 0.22m, the distance to the screen is 3.30m, and light of wavelength 662nm is used. If a thin sheet of polystyrene (n=1.49) is placed over the bottom slit only, the entire interference pattern moves downward on the screen by 3.5mm. What is the thickness of the polystyrene sheet?

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