Question

Two coherent sources whose intensity ratio is 25:16 produce interference fringes. Calculate the intensity of maxima and minima.

Answer 1

$$\begin{gathered} I_{max}={\left(\sqrt{I_1}+\sqrt{I_2}\right)}^2={\left(\sqrt{25}+\sqrt{16}\right)}^2={\left(5+4\right)}^2=81 \\ {I}_{min}={\left(\sqrt{I_1}-\sqrt{I_2}\right)}^2={\left(\sqrt{25}-\sqrt{16}\right)}^2={\left(5-4\right)}^2=1 \end{gathered}$$