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 raysr1andr2interfere and produce a maximum. The indices of refraction aren1= 1.32,n2= 1.85,n3= 1.41, and the thickness of material 2 isL= 315 nm. Find the wavelength in the visible range for this system.