Two coherent sources of light interfere. The intensity ratio of two sources is 1 : 4. For this interference pattern if the value of $\frac{{\mathrm{I}}_{max}+{\mathrm{I}}_{min}}{{\mathrm{I}}_{max}-{\mathrm{I}}_{min}}$ is equal to $\frac{2\mathrm{\alpha }+1}{\mathrm{\beta }+3},\text{ then }\frac{\mathrm{\alpha }}{\mathrm{\beta }}$ will be :