[Double_Cast]

Yellow, cyan, and magenta don't correspond to particular wavelengths. They each correspond to a combination of two particular, adjacent wavelengths.

E.g. a "yellow" wavelength is only as bright as its decomposition into red and green. The fact that red & blue aren't adjacent is a red herring.

[stepik777]

Yellow is about 575nm, while cyan is 490nm if this diagram is correct: https://en.wikipedia.org/wiki/File:PlanckianLocus.png