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Question: Answered & Verified by Expert
In a Young's double slit experiment the intensity at a point where the path difference is $\frac{\lambda}{6}$ ($\lambda$ being the wavelength of the light used) is $\mathrm{I}$. If $\mathrm{I}_0$ denotes the maximum intensity, $\frac{\mathrm{I}}{\mathrm{I}_0}$ is equal to
PhysicsWave OpticsJEE MainJEE Main 2007
Options:
  • A
    $\frac{1}{\sqrt{2}}$
  • B
    $\frac{\sqrt{3}}{2}$
  • C
    $1 / 2$
  • D
    $3 / 4$
Solution:
2063 Upvotes Verified Answer
The correct answer is:
$3 / 4$
$\frac{\mathrm{I}}{\mathrm{I}_{\max }}=\cos ^2\left(\frac{\phi}{2}\right)$

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