What is Poisson’s bright spot and why it exists? The importance of the Poisson Spot and Fresnel diffraction

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What is Poisson’s bright spot and why it exists?

Poisson’s spot is a bright point that appears at the center of a circular body’s shadow due to Fresnel Diffraction.

What was the importance of the Poisson Spot?

The Poisson Spot play an important role in the discovery of the wave nature of light and for the demonstration of the concept that ‘light behave as a wave’

What do you mean by Fresnel diffraction?

Fresnel diffraction equation which is used to calculate the diffraction pattern created by the wave that passing through an object.

Here is the Diagram for the demonstration purpose.

Reference Source:

[1] Wikipedia Contributors. “Arago Spot.” Wikipedia, Wikimedia Foundation, 30 June 2021, en.wikipedia.org/wiki/Arago_spot. Accessed 30 June 2021.

[2] Wikipedia Contributors. “Fresnel Diffraction.” Wikipedia, Wikimedia Foundation, 19 May 2021, en.wikipedia.org/wiki/Fresnel_diffraction. Accessed 30 June 2021.