State the postulates of Huygen's wave theory.
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Explanation:
The postulates of Huygens's wave theory are:
Every particle of the medium situated on the wave-front acts as a new wave-source from which fresh waves originates. These waves are called secondary wavelets.
The secondary wavelets travel in the medium in all directions with the speed of the original wave in the medium.
The envelope of the secondary wavelets in the forward direction at any instant gives the new wave-front at that point.
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