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A monochromatic light is travelling in a medium of refractive index n = 1.6. It enters a stack of glass layers from the bottom side at an angle theta = 30^(@). The interfaces of the glass layers are parallel to each other. The refractive indices of different glass layers are monotonically decreasing as n_(m)=n-m Delta n, where n_(m) is the refractive index of the m^(th) slab and Delta n =0.1 (see the figure). 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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