First slide

Diffraction

Question

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

Easy

A

Increase
B

Decrease
C

Remain constant
D

None of these

Solution

$A = nπdλ \Rightarrow nd = \frac{A}{πλ} = constant$
$\Rightarrow n \propto \frac{1}{d}$ (n = number of blocked HPZ) on decreasing d, n increases, hence intensity decreases.

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