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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 0.5 , what is the ratio of the minimum intensity to maximum intensity?
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Answer

$\frac{I_{\min }}{I_{\max }}=\left(\frac{1-r}{1+r}\right)^2=\left(\frac{1-0.5}{1+0.5}\right)^2=\frac{1 / 4}{9 / 4}=\frac{1}{9}$.

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