In Huygens’ theory, light waves are longitudinal and do not require a material medium for their propagation.

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The Huygens–Fresnel principle states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. The sum of these spherical wavelets forms a new wavefront.


In Huygens’ theory, light waves are longitudinal and do not require a material medium for their propagation.