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

${I}_{max}={\left(\sqrt{{I}_{1}}+\sqrt{{I}_{2}}\right)}^{2}={\left(\sqrt{25}+\sqrt{16}\right)}^{2}={\left(5+4\right)}^{2}=81\phantom{\rule{0ex}{0ex}}{I}_{min}={\left(\sqrt{{I}_{1}}-\sqrt{{I}_{2}}\right)}^{2}={\left(\sqrt{25}-\sqrt{16}\right)}^{2}={\left(5-4\right)}^{2}=1$

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