Huygens' wave model of light also provides a plausible explanation to why waves diffract around an edge of an opaque material. The absence of wavelets on the periphery causes the wavefront to scatter and propagate outward. As a result, the new wavefront is formed from the interference between wavelets that managed to pass through the opening. When light travels through a slit, some of these wavelets are obstructed and can no longer propagate. In the 17 th century, Christiaan Huygens proposed that when a wave reaches an opening, its wavefront can be perceived as individual points emitting spherical secondary wavelets. Huygens’s wave model of light is commonly used to understand the effect of diffraction.
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