Question: In a Youngs double-slit experiment using light of wavelength A, a thin piece of Plexiglas having index of refraction n covers one of the slits.

In a Young’s double-slit experiment using light of wavelength A, a thin piece of Plexiglas having index of refraction n covers one of the slits. If the center point on the screen is a dark spot instead of a bright spot, what is the minimum thickness of the Plexiglas?

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