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  • Consider the diffraction pattern for a small pinhole. As the size of the hole is increased A. the size decreases. B. the intensity increases.

 Consider the diffraction pattern for a small pinhole. As the size of the hole is increased
A. the size decreases.
B. the intensity increases.
C. the size increases.
D. the intensity decreases.

Answers (1)

The correct answers are the options (a, b)

Explanation:-

As the pinhole size increases, more light can pass through, leading to an increase in the intensity of the diffraction pattern, especially in the central maximum. The size of the hole increases, and the overall size of the diffraction pattern, particularly the central maximum, decreases in angular width.

Key concept: The 'shadow' of the hole of diameter d is spread out over an angle

\Delta \theta =1.22\frac{\lambda}{D}\Rightarrow \Delta \theta\propto \frac{1}{D}

 

 

Posted by

Gurleen Kaur

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