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Reflection by thin layers. In the figure below, light is incident perpendicularly on a thin layer of material 2 that lies between (thicker) materials...

Reflection by thin layers. In the figure below, light is incident perpendicularly on a thin layer of material 2 that lies between (thicker) materials 1 and 3. (The rays are tilted only for clarity.) The waves of rays r1 and r2 interfere and produce a maximum. The indices of refraction are n1 = 1.52, n2 = 1.94, n3 = 1.33, and the wavelength λ = 612 nm. Find the third least thickness.

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