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Wave Optics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsWave Optics2 Marks
Question
If the amplitude ratio $\left(E_{20} / E_{10}\right)$ of two interfering coherent waves producing an interference pattern is 0.8 , what is the ratio of the maximum intensity to the minimum intensity?
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Answer

$\frac{I_{\max }}{I_{\min }}=\left(\frac{1+r}{1-r}\right)^2=\left(\frac{1+0.8}{1-0.8}\right)^2=\left(\frac{1.8}{0.2}\right)^2=81.$

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