A double-slit experiment is set up using a helium-neon laser ( = 633 nm). Then a very

Question:

A double-slit experiment is set up using a helium-neon laser (λ = 633 nm). Then a very thin piece of glass (n = 1.50) is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been the m = 10 dark fringe.
How thick is the glass?

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