Light as a wave
In the nineteenth century Fresnel and Young observed the phenomena of interference and diffraction of light, which could not be explained with the hypothesis of Newton, and Foucault measured the speed of light in different media and observed that passing from air to water decreased its speed, as proposed by Huygens.
These findings allowed them to consolidate the ideas of Huygens on the wave nature of light, although there were still some unresolved issues related to the nature of light and its propagation in a vacuum.
propagation of light:
One of the most complex to explain the wave nature of light has been asked
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