Single Choice

To observe diffraction, the size of an obstacle:

Ashould be of the same order as wave length
Correct Answer
Bshould be much larger than the wave length
Chas no relation to wave length
Dmay be greater or smaller than the wave length

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.
Thus for greater diffraction, it is important that the size of the obstacle is directly proportional to the wavelength of the source. Suppose a is diffraction and $$\lambda$$ is the wavelength $$a \propto \lambda $$ Hence for diffraction, size of obstacle should be in the order of a wavelength

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