basic postulate of Hugyen's principal
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The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets.
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(1) Huygen proposed the wave theory of light. Light travels in form of wavefront in medium.
(2) According to this principle, energy is emitted in form of waves from light source.
(3) Each point on the wavefront acts as a centre of new disturbance and emits its own set of spherical waves called secondary wavelets.
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