To observe diffraction, the size of an obstacle:

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should be much larger than the wavelength.

should be of the order of wavelength.

has no relation to wavelength.

should be exactly $\frac{λ}{2} .$

answer is A.

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Detailed Solution

Diffraction is basically the bending of waves. The bending occurs due to obstacles. It occurs only when the wavelength is comparable to the size of aperture. As the wavelength increases, the diffraction effect will also increase.
Hence, for diffraction, size of obstacle should be of the order of the wavelength.

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