A dye absorbs a photon of wavelength λ and re-emits the same energy into two photons of wavelengths λ1 and λ2 respectively. The wavelength λ is related with λ1 and λ2 as:

1.  λ=λ1+λ2λ1λ2

2.  λ=λ1λ2λ1+λ2

3.  λ=λ12+λ22λ1+λ2

4.  λ=λ1λ2λ1+λ22

E=E1+E2; hcλ=hcλ1+hcλ2 hcλhc λ2+λ1λ1λ2;  λ=2λ1λ2λ1+λ2

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