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a monochromatic light is traveling in a medium of refractive index n=1.6 . it enters a stack of glass layers from bottom side at an angle (theta)=30 degrees. the refractive indices of different glass layers are monotonically decreasing as n(m)= n- m∆n, where n(m) is the refractive index of the mth slab and ∆n=0.1 . the ray is refracted out parallel to the interface between the (m-1)th and mth slabs from the right side of the stack. what is the value of m?

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