Reflection by thin layers. In the 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.) The waves of rays r, and r, interfere, and here weconsider the type of interference to be either maximum (max) or minimum (min). The table below provides the indexes ofrefraction n,, n2, and n3, the type of interference, and the thinlayer thickness L in nanometers. Give the wavelength that isin the visible range.n2ngn1n2n3Туре1.621.50min4181.77NumberUnits

The optical path length traversed by the light ray is, ∆=2Ln2=1354.32 nm Since the medium 3 is rarer…

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