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  4. In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will

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Q. In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will

Wave Optics

Solution:

$A=n \pi d \lambda \Rightarrow n d=\frac{A}{\pi \lambda}=$ constant
$\Rightarrow n \propto \frac{1}{d}( n =$ number of blocked $H P Z)$ on decreasing $d$,
$n$ increases, hence intensity decreases.