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The Poisson-Arago Spot
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From Fresnel’s wave theory of light Poisson deduced in 1818 that a spot of light should appear at the center of the shadow of a circular obstruction. Poisson’s predicted spot had been observed by Maraldi one hundred years earlier. Arago performed Poissson’s thought experiment and rediscovered Maraldi’s long forgotten spot. This phenomenon is one historically imprtant confirmation of Fresnel’s wave theory of light and it is known as the Poisson-Arago bright spot.
Title: The Poisson-Arago Spot
Description:
From Fresnel’s wave theory of light Poisson deduced in 1818 that a spot of light should appear at the center of the shadow of a circular obstruction.
Poisson’s predicted spot had been observed by Maraldi one hundred years earlier.
Arago performed Poissson’s thought experiment and rediscovered Maraldi’s long forgotten spot.
This phenomenon is one historically imprtant confirmation of Fresnel’s wave theory of light and it is known as the Poisson-Arago bright spot.
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