The wave theory was not readily accepted primarily because of
Newton’s authority and also because light could travel through vacuum
Rationalised 2023-24
Physics
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and it was felt that a wave would always require a medium to propagate
from one point to the other However, when Thomas Young performed
his famous interference experiment in 1801, it was firmly established
that light is indeed a wave phenomenon The wavelength of visible
light was measured and found to be extremely small; for example, the
wavelength of yellow light is about 0 6 mm