The condition for diffraction is

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(A) Diffraction is the bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow.For significant

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$a/\lambda = 1$

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(A) Diffraction is the bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow.For significant diffraction to occur,the size of the obstacle or aperture $(a)$ must be comparable to the wavelength of the incident wave $(\lambda)$.Mathematically,this condition is expressed as $a \approx \lambda$,which implies $a/\lambda \approx 1$.

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