When a surface is illuminated with light of wavelength l the maximum kinetic energy of the emitted electrons is 1.2 eV. If the wavelength λ = 0.8λ is used the maximum kinetic energy increases to 1.76 eV, and for wavelength λ = 0.6λ the maximum kinetic energy of the emitted electrons is 2.676 eV. Determine the work function of the surface and the wavelength λ.