How light can be treated as a wave ?

Question : How  light can be treated as a wave ? 

In 1679, Huygens proposed the wave theory of light in which he said that each point of a source of light sends out waves in all directions. The locus of all particles vibrating in the same phase is called wavefront. Each point of the wavefront acts as a centre of new disturbance and emits its own set of wavelets. The locus of these wavelets in the forward direction gives the position of the new wavefront at subsequent times

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