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 θ = 30 ° . The interfaces of the glass layers are parallel to each other. The refractive indice

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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 θ = 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 Δ n where n m is the refractive index of the m t h slab and Δ n = 0.1 (see the figure). The ray is refracted

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Applying snell's law between entry & exit surfaces, n sin ⁡ &theta; = &mu; sin ⁡ &pi; 2 &rArr; 1.6 sin ⁡ 30 o = &mu; sin ⁡ &pi; 2 &there4; &mu; = 0.8 &there4; 0.8 = n - m &Delta; n = 1.6 - m &times; 0.1 &there4; m = 8

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