Consider the diffraction pattern obtained from the sunlight

Question:

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter $0.1 \mu \mathrm{m}$. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such thtat :

  1. its size decreases, and intensity decreases

  2. its size increases, and intensity increases

  3. its size increases, but intensity decreases

  4. its size decreases, but intensity increases


Correct Option: , 4

Solution:

$\sin \theta=\frac{m \lambda}{a}$

when a increases, $\theta$ decreases,

width decreases

width decreases so intensity will increases

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