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  • Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter . If the diameter of the pinhole is slightly increased, it will aff

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 \mu m. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such thtat :
 
Option: 1 its size decreases, and intensity decreases
 
Option: 2 its size increases, and intensity increases
 
Option: 3 its size increases, but intensity decreases
 
Option: 4 its size decreases, but intensity increases

Answers (1)

best_answer

For diffraction through a single slit, for the first minimum

Sin\theta=\frac{1.22\lambda }{D}

If D is increased, then Sin\theta will decrease i.e \theta will decrease

∴ size of circular fringe will decrease.

i.e the size of the diffraction pattern will decrease.

And as \theta decreases, the width decreases, and as width decreases so the intensity will increases.

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Deependra Verma

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