The figure shows Fraunhoffers diffraction due to a single slit. If first minimum is obtained in ...

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The figure shows Fraunhoffers diffraction due to a single slit. If first minimum is obtained in the direction shown, then the path difference between
\( \mathrm{P} \)
rays 1 and 3 is
(1) 0
(2) \( \lambda / 4 \)
(3) \( \lambda / 2 \)
(4) \( \lambda \)
W
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