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A monochromatic light is traveling in a medium with refractive index n=1.6. It enters a stack of glass layers from the bottom side at an angle theta=30 degrees. The layer interfaces are parallel. The refractive indices decrease by (delta)n=0.1 for every layer. When the ray reaches the mth interface, it becomes parallel to the plates m=? (m can be any number between 1 and 9, inclusively.)

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