The figure shows Fraunhoffer's diffraction due to a single slit. If...
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The figure shows Fraunhoffer's diffraction due to a single slit. If first minimum is obtained in the direction shown, then the path difference between rays 1 and 3 is
(a) 0
(b) \( \lambda / 4 \)
(c) \( \lambda / 2 \)
(d) \( \lambda \)
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