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The father of the wave theory of light is Christiaan Huygens, a Dutch physicist. He proposed the theory in the 17th century, suggesting that light travels in the form of waves rather than particles. Huygens’ wave theory was later confirmed by experiments, and it helped explain phenomena like refraction, diffraction, and interference, which couldn't be fully explained by the particle theory of light at the time. His work laid the foundation for the later development of the understanding of light as an electromagnetic wave, as we understand it today.