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Diffraction is defined as the bending or flaring of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle. This flaring is consistent with the spreading of wavelets in the Huygens construction. Diffraction occurs for waves of all types, not just light.

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Why do shadows from the sun join each other when near enough?

I do not guarantee this is the correct answer, but you can verify it practically. The light rays causing the shadow of your hand and that of your book, are not parallel. The bulging of shadows as th …
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