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Question: Answered & Verified by Expert
Two coherent plane light waves of equal amplitude makes a small angle $\alpha(< < 1)$ with each other. They fall almost normally on a screen. If $\lambda$ is the wavelength of light waves, the fringe width $\Delta x$ of interference patterns of the two sets of waves on the screen is
PhysicsWave OpticsJEE MainJEE Main 2012 (19 May Online)
Options:
  • A
    $\frac{2 \lambda}{\alpha}$
  • B
    $\frac{\lambda}{\alpha}$
  • C
    $\frac{\lambda}{(2 \alpha)}$
  • D
    $\frac{\lambda}{\sqrt{\alpha}}$
Solution:
1088 Upvotes Verified Answer
The correct answer is:
$\frac{\lambda}{(2 \alpha)}$
$\Delta x=\frac{\lambda}{(2 \alpha)}$

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