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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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What happens to waves when they hit smaller apertures than their wavelenghts?

http://www.nature.com/nature/journal/v445/n7123/box/nature05350_BX1.html You can find a complete answer in above link.The theory which is introduced can be valid for mechanical waves such acoustic and …
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