Transmission through thin layers. In Figure, 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.) Part of the light ends up in material 3 as ray r₃ (the light does not reflect inside material 2) and r₄ (the light reflects twice inside material 2). The waves of r₃ and r₄ interfere, and here we consider the type of interference to be either maximum (max) or minimum (min). For this situation, each problem in Table 35-3 refers to the indexes of refraction n₁, n₂, and n₃, the type of interference, the thin-layer thickness L in nanometers, and the wavelength λ in nanometers of the light as measured in air. Where λ is missing, give the wavelength that is in the visible range. Where L is missing, give the second least thickness or the third least thickness as indicated.

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na 123 ni n2 Type 1.60 1.40 1.80 2nd 632 min