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Explain the refraction of plane wavefron...

Explain the refraction of plane wavefront of light through a prism.

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The secondary wavelets form B will travel almost the whole distance inside the prism to reach the point C. But the secondary wavelets from K will travel the whole distance in air before it is incident on the prism at A. The points K and B are phase, and so do L and C. LC and KB represent the plane wavefronts.
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