. Explain the Principal of Huygen’s

Best Answer

According to Huygen’s principle, every point on a given wavefront can be regarded as a fresh source of new disturbance and sends out its own spherical wavelets called secondary wavelets. These secondary wavelets spread out in all directions with the velocity of the wave.

A surface touching these secondary wavelets tangentially in the forward direction at any instant \left( \Delta t \right)(Δt) gives the position and shape of the new wavefront at the instant. This is called “secondary wavefront”.


As discussed in the introduction Huygen’s principle of secondary wavelets could explain many optical phenomena like reflection, refraction, interference, and diffraction, but it could not explain why wavefronts of secondary wavelets are formed in the forward direction and not in the backward direction.

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