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Updated: June 18, 2025
Whatever the difference of their course, the intensity of the light is always the sum of the intensity of the two rays. Fresnel perceived that this experiment absolutely compels us to reject the hypothesis of longitudinal vibrations acting along the line of propagation in the direction of the rays.
Fresnel founded his theory of double refraction and reflexion by transparent surfaces, on the hypothesis that the vibration of a ray of polarized light is perpendicular to the plane of polarization. But Neumann has proposed, on the contrary, a theory in which he recognizes that the luminous vibration is in this very plane.
Science has demonstrated that while ether pervades everything the ether which is actually in a body is different from the ether outside it. "Bound" ether is the name given to this, which Fresnel and others have shown to be denser.
Your advice accords with my intention. That is why I need the boat." "Ah, that, no," said Fresnel, with determination. "I'll hold my peace, but it's as much as my skin is worth to help you. "You need not have seen my face. Forget that you have seen it." "I'll do that, monsieur. But that is all I will do. I cannot put you across the river."
The lighthouse arrived. It was a very good house for that day. The keeper's dwelling had three rooms and was solidly built. The tower was thirty feet high. The lantern held a revolving light, with a four-wick Fresnel lamp, burning sperm oil.
But about 1818 the experiments of Fresnel and Arago with polarization of light made it seem very doubtful whether the theory of longitudinal vibrations is sufficient, and it was suggested by Young, and independently conceived and demonstrated by Fresnel, that the luminiferous undulations are not longitudinal, but transverse; and all the more recent experiments have tended to confirm this view.
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