State the Postulates of Huygen's wave theory. Draw the type of wavefront that corresponds to a beam of light (i) coming from a very far off source and (ii) diverging from a point source.
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These waves are called secondary wavelets. ... What is the shape of the wavefront diverging from a point source of light? ... Draw a neat and lebelled diagram. ... Short Answer Type.
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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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