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Question: Answered & Verified by Expert
A parallel beam of light of wavelength $\lambda$ is incident normally on a narrow slit. A diffraction pattern formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is:
PhysicsWave OpticsNEETNEET 2013 (Karnataka)
Options:
  • A $2 \pi$
  • B $3 \pi$
  • C $4 \pi$
  • D $\pi \pi$
Solution:
2322 Upvotes Verified Answer
The correct answer is: $4 \pi$
We know that path difference for second minimum $=2 \lambda$
$$
\begin{aligned}
\therefore \text { Phase difference } & =\frac{2 \pi}{\lambda} \times 2 x \\
& =4 \pi
\end{aligned}
$$

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