To observe diffraction, the size of an obstacle :

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should be of the same order as wavelength

should be much larger than the wavelength

has no relation to wavelength

should be exactly ( $λ$ /2)

answer is A.

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Detailed Solution

The correct option is B. should be of the order of wavelength. For diffraction λ≈ d , so the size of the obstacle should be comparable to the wavelength of light.

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