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State Huygens' principle of diffraction ...

State Huygens' principle of diffraction of light.

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Huygens' principle : Every point on a wavefront acts as a secondary source of light and sends out secondary wavelets in all directions. The secondary wavelets travel with speed of light in the medium and are effective only in the for ward direction. At any instant, the forward-going envelope or the surface of tangency to these waveets gives the position of the new wavefront at that instant.
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