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Reflection by thin Layers

Reflection by thin layers. In the figure below, light isincident perpendicularly on a thin layer of material 2 that liesbetween (thicker) materials 1 and 3.(The rays are tilted only forclarity.) The waves of rays r1 andr2 interfere and produce a minimum. The indicesof refraction aren1 = 1.51, n2 = 1.33, n3 = 1.47, and the thickness of material 2 isL = 420 nm. Find thewavelengthin the visible range for this system.
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