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Wave Optics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsWave Optics2 Marks
Question
In Young's double-slit experiment using light of wavelength 5000 Å, what phase difference corresponds to the 11th dark fringe from the centre of the interference pattern?
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Answer

The required phase difference is $(2 m -1) \pi$ $rad =(2 \times 11-1) \pi rad =21 \pi rad$.

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