In a double-slit experiment with λ=600 nm, a transparent sheet of thickness t is placed in front of one slit. The graph of number of shifted fringes N versus refractive index μ is shown. Find t.

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In a double-slit experiment with λ=600 nm, a transparent sheet of thickness t is placed in front of one slit. The graph of number of shifted fringes N versus refractive index μ is shown. Find t.

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