The first crucial experiment in favour of wave theory was given by\

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Professor PC Thomas Classes · Answer

According to Huygen's wave theory, speed of light in a rarer medium. According to Newton's corpuscular theory the speed of light in a denser medium is greater than that in a rarer medium. Faucault experimentally showed that the speed of light in water is less than that in air. This was in favour of Huygens' wave theory.\